Use for T-REX450X/XL Tail unit housing(R) x 1 Tail unit housing(L) x 1 Tail pulley assembly x 1 Bearing(MR52ZZ) x 1(2x5x2.5mm) Collar screw x 1(M2x12) Self tapping screw x 3(M2x10) Self tapping screw x 2(M2x16)