Aroundsquare's Knucklebones are the original knuckle roller. The kbones are deceptively simple. They serve exceedingly well as a worry stone or discrete fidget item, but they go far deeper into the realm of serious tools and playable art. Our knucklebones are purpose built for skilled manipulation, and can be used to exercise the fingers and creativity as dexterity trainers, mindfulness tools, and skill toys.