Align T-REX 450 Metal Tail Rotor Control Arm Set Use for T-REX 450 SE/V2/PRO series Metal tail rotor control arm x 1 Washer x 1(?2x?3.6x0.2mm), Washer x 2(?2x?3.6x0.5mm) Bearing MR52ZZ x 2(?2x?5x2.5mm) Linkage ball A(M2x2.5) x 1(?4.75x7.18mm), Collar screw x 1(M2x9mm)