This is a replacement Tekno RC CV Rebuild Kit, and is intended for use with the Traxxas Slash, Slash 4x4, Losi SCTE, Ten-T and 810 vehicles equipped with the optional Tekno RC M6 Driveshafts. This kit includes two barrels and two pins and will work with the following Tekno RC Driveshaft Sets; TKR6851X, TKR6852X, TKR1951X and TKR2210X.