KEVA planks are high precision blocks of identical construction that stack with surprising stability. Practically perfect planks make it possible.
Contraptions are ramps and chutes, tracks and towers, tunnels, funnels and more made simply by stacking KEVA planks. No glue or connectors are used, just gravity and imagination. Two specially-designed KEVA balls provide bouncy action and surprising moves. Make the ball roll, twist, bump, bounce, hop and stop through your contraption. The contraptions guidebook shows you how.