Keva Contraptions 200 Piece Set- MindwareYoung thinkers can build unbelievable ball track structures with this simple stacking plank set. Create ramps, funnels, chutes and crazy contraptions like the Black Hole and Bounce Plate. Then find out if the ball rolls as expected. No glue, no connectors: just loads of constructive fun! Includes: KEVA Contraptions 200 piece plank set contains 200 wooden planks 2 specially designed lightweight balls for maximum action An 18 page idea book with project