These spiral wristband keychains are seriously handy for so many situations. Made from high-quality TPU material that's soft, stretchy, and surprisingly durable - they can take quite a bit of pulling and stretching without breaking. The spiral design stretches to fit most wrist sizes comfortably, and the inner diameter is about 3cm while the outer is 5.5cm. They're waterproof, which makes them perfect for the gym, pool, sauna, or beach where you need to keep your keys secure but accessible. The metal ring lets you attach keys, locker tags, ID badges, whistles, or pretty much anything else you need to keep track of. What's cool is they double as hair ties in a pinch, and since you get 50 of them in this purple color, you can keep them everywhere - car, gym bag, work desk, home entryway. They're reusable too, so unlike those cheap plastic wristbands that break after a few uses, these actually hold up over time. Great for hotels when you're going to the pool and don't want to carry your whole key card holder. The material is non-toxic and odorless, so they're comfortable to wear for extended periods. Having a bulk pack means you can share with family members or keep spares for when you inevitably lose a few. Honestly, for how inexpensive they are per piece, these are one of those simple products that just make life a little easier.