With a flick of the wrist, set the balls in motion and witness Newton's classic laws of physics in action. As the first ball swings around, it always stops when it hits the second ball, which then steals its kinetic energy, allowing it to swing around. Once you get KaBlaster going, you won't want to put it down! This unique yo-yo puts the "fun" in fundamental physics. Available in Blue and Yellow or Purple and Green.
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