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sphere diameter 36mm. perfect cat toy ball with pentagonally shaped tiles mounted on a spring. When cats play with it the ball creates a fast rebound to challenge the cats reflex. My cat is loving it. There is a second version "bouncing cat toy ball perforated" available with pierced pentagonally tiles which makes it possible for the cat to grab it with teeth or it's claws. https://www.shapeways.com/product/QJCZSG2AC/bouncing-cat-toy-ball-perforated-size-s