Discover bouncy ball istics with the hyperlauncher rocket ball workshop make cosmic ray launchers and supersonic bouncers learn about the science of elasticity polymers energy and motion with this fascinating rocket ball science kit just follow the colour illustrated activity guide to see how it s done just one of a range available from interplayr age 8 years r contains red water based moulding granules 4 x moulds safety goggles plastic tubes wooden dowel colour instruction manual