Hobbypower Motor Mount Landing Skid X525 500 550 Quad-rotor Multi-copter Folding Frame (Pack of 2sets) 2 SETS Motor Mount &Landing skid for X525 500 550 Quad-Rotor Multi-copter Folding Frame Used for 2212 2208 2216 series motor Suited for 12mm -15mm Aluminum tube Weight:23gram (2pcs Landing skid,one motor mount) Right part to build or repair x525 500 600 Muiticopter