Miniature Laser Cut Birch Catapult Kit - DOXapult Miniature Catapult Kit for teaching the basic concepts of design of experiments, Newton's laws of motion, projectile motion, simple machines, and force Precision laser cut cabinet grade Birch wood and Latex Free elastic bands Projectiles can be a penny, nickle, dime, or quarter Easy to adjust throwing distance Simple to assemble with provided Superglue