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Linkage Ball-AUse for T-REX 450L / 500 / 550 / 600 / 600 NitroSteel ball parts is made of rigid stainless steel, features wear-resisting, and anti-oxidization. Therefore this refitting component is absolutely helpful for the accuracy of flying movement control and the stable of the flight.Specifications:Linkage ball A(M2x3.5) x 9(4.75x8.18mm)M2 nut x 9