●Length 37mm Diameter 12mm Hole Diameter 5mm Color Black Material Rubber ●Rubber bellows radio box seals are made of rubber, sturdy and durable, which has a long service life. ●Replacement for RC electric boat, brushless electric boat, methanol boat, petrol boat tail bar waterproof. ●Upgrade your RC boat and help improve its performance. ●Package includes 5 pieces waterproof bellows for RC model boat.