Sensory fascination so fun it's silly! Each ring is covered in a soft, rubbery material, features unique textures for the fingers to explore, and has a built-in rattle that delights the ears. Plus... They all connect to each other - in any order and from any side - magnetically! Stack, roll, shake, explore, discover... Young minds bloom and giggles abound the moment little ones get their hands on the SillyRings.