Young thinkers can build unbelievable ball track structures with this simple stacking plank system. Create ramps, funnels, chutes and crazy contraptions like the "Black Hole" and "Bounce Plate." Then find out if the ball rolls as expected. Fostering unlimited creativity and experimentation, KEVA planks build an early understanding of proportion and balance, while teaching basic principles of physics and engineering. No glue, no connectors-just loads of constructive fun! Contraptions planks are made from pine. Includes 50 high precision pine KEVA planks, 2 specially designed lightweight and bouncy KEVA balls, instruction booklet Recommended for 1 or more players, ages 7 and up WARNING: CHOKING HAZARD - Small parts Not for children under 3 years of age Made in China Imported Product Specifications Package dimensions: 8.25 in x 2.75 in x 8.1 in Material & Care Plastic Wipe clean with dry or damp cloth