The secret of the power of! Roller coaster try to make the course of only [science] work their dynamics (japan import)

الوصف

Let's observe the movement of the ball to make free the various course! Product size / basic square: 25.2 x 20 x 20mm, joint A: 20 x 20 x 13mm, sucker: 36 x 17.2mm Material / ABS (block), PE (rail), PP (ball)