The Sporn Unpredictaball is half the ball but TWICE the fun! It rolls and bounces like crazy due to its unique design. Stuff with treats or peanut butter for extra enjoyment. Made of durable, non-toxic rubber. Dishwasher safe (top rack). Available in two sizes: XS/SM (dogs under 11kgs) and MD/LG (dogs over 11kgs). Only available in blue colour shown.