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.
This perforated version is available in sizes S, M and L.
There is a second version "bouncing cat toy ball smooth" available.
https://www.shapeways.com/product/CJPZ2YDXF/bouncing-cat-toy-ball-smooth-size-s