What String to Use for Bracelets: Choosing the Right Cord for Your Design

What string to use for bracelets depends on one thing: the bead. Polymer clay heishi beads need stretch. Seed beads need structure. Kids’ projects need something that won’t snap mid-thread. Pick the wrong cord, and you’ll spend more time restringing than designing. Pick the right one, and your first bracelet takes under ten minutes.

This guide breaks down the three main string types—elastic, nylon, and cotton—by use case, not by marketing claims. If you want a deeper dive into how individual cord materials compare on strength and flexibility, we covered that in our best string for bracelet making breakdown. Here, we’re focused on helping you match string to project.

Start with the Use Case: What Kind of Bracelet Are You Making?

The string question gets easier once you stop thinking about string and start thinking about the bracelet you’re wearing tomorrow morning.

Three common scenarios cover most beginner-to-intermediate projects:

• Clay bead bracelets (heishi, polymer clay flat discs): These need elastic cord. The beads slide on and off the wrist, so the string has to stretch and recover without losing shape. If you’re making one of these, skip ahead to the elastic cord section. For a full walkthrough, see our clay bead bracelet guide.
• Seed bead or woven designs: These use non-stretch thread—nylon, silamide, or Fireline—because the structure comes from the weave, not the string. A stretchy cord here would distort the pattern.
• Kids’ friendship bracelets and name bracelets: These need cord that’s thick enough to handle, safe to put near skin, and forgiving when small fingers pull too hard. A six-year-old tying her first knot doesn’t need a lecture on tensile strength. She needs string that holds.

Identify which of these matches your project, and the cord decision is already half-made.

Elastic Cord: The Standard for Stretchy, Everyday Bracelets

Elastic cord is what most people are looking for when they search for the best string for bracelet making. It’s the default for modern beaded bracelets—and for good reason.

The number that matters: 0.8mm. That’s the thickness where elastic cord stops breaking on people. We tested ours by pulling it to twice its length, holding for ten seconds, and releasing. It recovered every time. According to our supplier’s tensile data, it’s rated for over 5,000 stretch cycles. We pulled it ourselves because we don’t take supplier data at face value.

Why 0.8mm works for most projects:

• It fits through standard polymer clay bead holes without forcing.
• A double surgeon’s knot—the two-loop method—cinches tight and tucks inside the last bead. No visible knot, no tail sticking out.
• It doesn’t require a needle. Thread it directly, which matters when the person stringing is eight years old and has never held a beading needle.

Safety note: Our elastic cord is ASTM F963 certified, lead-free, and non-toxic. This is the US standard for children’s products. If you’re buying cord separately (not from a kit), check the listing for these labels. Many cheap spools on Amazon don’t carry them.

For a complete list of what elastic cord can and can’t do, our bracelet string comparison covers the technical specs in more detail.

Nylon and Cotton Strings: For Woven, Tied, or Themed Designs

Nylon and cotton serve different projects than elastic cord. They’re not better or worse—they’re for different hands.

Nylon cord offers almost no stretch. That’s a feature, not a flaw, when you’re doing macramé, seed bead weaving, or adjustable slider closures. The string holds its shape, so the pattern stays intact. If you’re working with a beading loom or threading 2mm seed beads with a needle, nylon is the standard. It also works for hemp friendship bracelets with sliding knots—the kind where you pull the ends to adjust the size.

Cotton string (including hemp and waxed cotton) suits large-hole beads—wood, acrylic, ceramic—or boho-style knotted designs. It has a texture that some people prefer over the slick feel of nylon. The trade-off: cotton frays faster with daily wear. If the bracelet is going on a kid who washes her hands twelve times a day, cotton will show wear within weeks.

One important limitation: neither nylon nor cotton works well for making bracelets with beads that need to slide over the wrist. Without stretch, you’d need a clasp, which adds complexity. For a child’s first project, that’s usually one step too many.

Key Factors to Compare: Stretch, Strength, Safety, and Cost

Here’s the comparison table we wish existed when we were figuring this out ourselves:

On cost: buying cord separately means you also need to source scissors, a measuring tool, beads, and storage. An all-in-one bracelet making kit bundles everything—cord, beads, scissors, needle, ruler, and a storage box. Nothing sold separately. For someone starting from zero, that’s fewer decisions and fewer shipping boxes.

Matching String to Your Bead Type: A Quick Pairing Guide

The fastest way to pick wrong: choose the string before you’ve chosen the bead. Here’s the pairing that works for each bead type:

• Polymer clay / heishi beads (flat discs): 0.8mm elastic cord. The bead holes are sized for this thickness. Stretch accommodates daily on-and-off. This is what goes in every Beadlo kit.
• Seed beads (1–3mm glass): Nylon or silamide thread, 0.25–0.5mm, with a beading needle. These beads are too small for elastic cord to pass through cleanly, and the designs usually depend on tight, non-stretch construction.
• Large-hole beads (wood, acrylic, ceramic): Cotton or nylon string, 1mm+. The larger hole means you can double-string for added strength without struggling to thread it.
• Letter beads (acrylic or silicone): 0.8mm elastic cord. Letter beads are popular for name bracelets, and elastic lets the bracelet stretch over the hand. One detail most kits get wrong: vowel count. We calculated letter frequency from the 2023 US top 50 girls’ names and adjusted our kits accordingly—more E’s, A’s, and I’s than you’d find in a standard 26-each letter set.

If you’re still deciding between bead types, our guide to the benefits of beaded bracelet making walks through what each style offers beyond just the finished bracelet.

Why We Test Every Batch: Our Approach to String Quality

We don’t have a lab. We have a worktable and two hands.

When a new batch of elastic cord arrives at Beadlo, we pull it to twice its length, hold for ten seconds, and release. If it doesn’t snap and recovers cleanly, it passes. If it shows any fraying, any slack, any discoloration—it goes back. This isn’t a formal testing protocol. It’s the same thing I’d do in my classroom with a box of supplies from Amazon, except now I do it with every shipment before it reaches your door.

The test that started all of this: I once bought a batch of elastic cord described as “high elasticity.” It lasted two stretches before it started to fray. That was the cord in the kit that made a six-year-old named Emma cry when she couldn’t find a second letter E. She said, “But my name has two E’s.” That’s when I stopped buying whatever was cheapest and started testing everything by hand.

Every Beadlo kit includes:

• 0.8mm elastic cord — tested to 5,000+ stretch cycles
• 48 colors, 5,000+ beads — enough to make 50+ bracelets
• Vowel-weighted letter beads — because Emma, Ella, and Evelyn are common names
• Scissors, needle, ruler, and a storage box with labeled compartments
• ASTM F963 certified, lead-free, non-toxic materials — safe for kids 6+

Nothing sold separately. Open the box, read the knot guide, and start stringing.

Frequently Asked Questions