A bumpy, sensory fun bracelet. At 60mm internal diameter, it can fit most adult hands as it stretches easily. But the Wave is also not too bulky for little wrists. With an ultra soft feel, they are chewable, twist-able and fun. The Wave Bracelets stack beautifully too! Suitable for moderate chewing. Useful for nail biters! Just wear over the four fingers as a barrier to the nails and re-direct chewing to the bracelet.