Specifications:Brand: WalkeraPart number: HM-Master CP-Z-21Suit for: Walkera 6CH 3D RC Helicopter Master CPPackage size: 10 * 10 * 2cm / 4 * 4 * 0.8inPackage weight: 100g / 3.4ozPackage list:1 * Original Walkera Master CP Part HM-Master CP-Z-21 Main Motor