Steel balls a must have , alum balls wear out and you get control slop Steel 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. Stainless steel linkage ball x 16 Stainless steel ball link(long) x 1 Cross screw(M2x14) x 1 Cross screw(M2x6.5) x 16
