Features Back to Top ^ EPP - Expended Poly Propylen hull Overview Back to Top ^ Enjoy flying indoors with this shaped hull. It is made of EPP (Expanded Polypropylene), which combines both lightness and solidity. The indoor Hull is attached to the body of the AR.Drone using two magnets, one on the hull and one on the body of the AR.Drone. The indoor hull will protect you from piloting mistakes; you may touch walls or fly across doors safely. If the AR.Drone happens to bang against a wall, the elasticity of the EPP will make it bounce back. The AR.Drone frontal camera detects automatically the color of the other AR.Drone hulls thanks to stickers that are included in this kit, which makes multiplayer gaming possible.