Diameter: 3.5" (approximate because every Doinkit™ is hand made. Sizes vary slightly. It gives them the personal touch.) There are exactly 32 "Doinks"/Ball Doinkits™ actually bounce! Doinkits™ weigh approx. 19gms. A Doinkit™ can be hit the entire length of a tennis court using a tennis racket.

• Doinkits™ have an important place in the scientific community. They may even win me a Nobel Prize in science.
  To find out more, click here.

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