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Build your own medieval siege engines from pre-drilled KEVA planks, a little glue and the help of easy, step-by-step "blueprint" instructions. Then let the fun and experimentation begin! The Catapult allows you to test launch distance by adjusting the arm recoil or the height of the flight deck. What will go farther, a marshmallow or a piece of macaroni? The Trebuchet can vary its hurl by altering the counterweight; experiment to knock down a field of target planks using the two included balls. The Wrecking Ball is a master of destruction! Turn cranks, a winding drum, a removable boom and hoist rope provide huge impact and a smashing lesson on pendulums and the effects of energy and motion.EXCLUSIVE! Buy all three siege engines and get a FREE set of 50 bonus planks to use as targets!