Hot Racing SLF125X06 Aluminum Center One-Way Differential Traxxas 4x4 SlashThis is the optional Hot Racing Center One Way Differential for the Traxxas Slash 4x4. FEATURES: Transfers power to front differential under acceleration, and allows front diff to freewheel while decelerating or braking Ideal for racing tight tracks where maximum off power steering is needed Thirty day limited warranty beginning at date of purchase valid in the United States only INCLUDES: Center One Way Diff with pre installed 6x10mm Ball Bearing