● Suitable for T-REX 500E PRO / 500EFL PRO. ● 6061-T6 Aluminum alloy material and CNC processed.● Metal Main rotor holder x 2● MR126ZZ Bearing x 4 (Φ6xΦ12x4mm)● Socket collar screw x 2 (M3x20mm)● M3 nut x 2● Weight:41.3g