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This new counterweight rock thrower which is designed and developed by shujule has been improved so that it is easier to assembleThe counterweight rock thrower appeared in the medieval siege warfare. The most prominent feature is that the lifting runner is located at the front of the body so it is also called the front runner rock thrower. This layout makes the rear slide of the fuselage clean and smooth which is more conducive to stone projectile installation and projectile. The counterweight rock thrower uses the principle of leverage. There is a heavy object on one end and a stone to be launched on the other end. Before launching the end where the stone is placed must be pulled down with a winch and the other end with the heavy object is also rising at this time. Let go of the rope let one end of the heavy object fall and the stone projectile was thrown. Features:.Precision cutting error control within 5 microns excellence.Applicable Age: 14 years old or olderSpecifications:.Color: As Shown.Material: Wood.Product Dimensions: 38 x 20 x 21cm.Product Weight: 600g.Package Dimensions: 27 x 17 x 5cm.Package Weight: 700g.Packing: Carton BoxPackage Content:.1 x Ancient Chariot DIY Model kits .1 x English manual .1 x toolset