Gently used. 200 pine planks that are like new. One Keva ball. One white non-keva ball. Age 7+ From seller website: Young 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 and an 18-page idea book with project photos and quick-start instructions. • Basic building planks can be used to build endless configurations• Fosters creativity, experimentation and STEM education• Builds an early understanding of proportion, balance and basics of physics & engineering• Planks are made from solid, unfinished pine Age Recommendation: Ages 7 and up