Linkage Ball H60089T for RC helicopter Align T-Rex 600. Included:Linkage ball A M2x3.5 (Ø4.75x8.68mm) - 6 psc,Linkage ball B M2x3 (Ø4.75x9.77mm) - 6 psc,Linkage ball A T2.6x3.5 (Ø4.75x8.68mm) - 6 psc,Linkage ball B T2.6x5.5 (Ø4.75x12.27mm) - 6 psc,Long linkage ball M2x3 (Ø4.75x24.59mm).