This is the Center Halfshaft Set for the Traxxas T-Maxx 3.3 RTR. FEATURES: Constructed of hardened composite material with steel U-joints Center front and center rear driveshaft assemblies INCLUDES: Two external splined halfshafts Two internal splined halfshafts Four metal U-joints REQUIRES: Installing between transmission and differentials SPECS: Rear Internal Splined Halfshaft Length: 1.6" (40.5mm) Front Internal Splined Halfshaft Length: 2" (51mm) Front and Rear External Splined Halfshaft Length: 1.57" (40mm) COMMENTS: These halfshafts are specific to the 3.3 T-Maxx and will not fit in any other version.