Reptile-Martian 220mm 4-Axis Carbon Fiber Quadcopter Frame 4mm Arm with Power Distribution Board for FPV Upgraded Version This quadcopter frame is a upgrade version of Martian quadcopter frame Kits and Support Gopro Camera The carbon baseplate thickness is 2mm. More copper on the power distribution board 4mm carbon fiber arm Material: Carbon fiber Wheelbase: 220mm