Young learners can create a wide selection of fun structures using the 50 planks in this set. The 2 balls can then roll through the hand-built designs, and the guide book provides helpful instructions that are easy to follow. Includes 50 pine planks, 2 balls and an instruction book. Allows children to create exciting ball track structures by simply stacking the included planks. Guides kids through construction of a Shooting Gallery, Turbine, Step Curve and more. Compatible with 200-plank KEVA Contraptions Set (not included). For students in 1st grade to 8th grade, ages 7 to 14 years old.