Check the listing for details. SpeedTek RC Arrma 6S Locked Differential Spool W/O Diff Cups (FRONT/CENTER/REAR). Color: Silver, Condition: New. Listed at 14.99 USD. Arrma 6s Locked Differential Spool. Hardened 416 Stainless Steel Fits all three differentials (Front, Center and Rear). Replaces differential components (ARAC4010) completely locking it up. Hardened 416 Stainless Steel Fabricated. Replaces differential components, completely locking it up. Precisely CNC machined from Hardened 416 Stainless Steel to fit factory Differential case (ARAC4006) (including most aftermarket one-piece aluminium versions also) – replacing diff gears (ARAC4010). Mating precisely with the Diff main gear (ARAC4008) or Spur gear (ARAC9310) & JJ or Arrma Diff cups (AR310432) like a glove to ensure minimal wear on differential housing components. Individually balanced and designed to endure massive centripetal force under speed runs. Easily swap in and out with factory differential components going from unlocked to locked setup in a matter of minutes. Locking differential forces both left and right wheels on the same axle to rotate at the same speed under nearly all circumstances, without regard to tractional differences seen at either wheel. A locked differential can provide a significant traction advantage over an open differential, but only when the traction under each wheel differs significantly. IDEAL For On/Off Road Speed Runs and/or Specific stunts. Rated up to 8S LIPO. 100% satisfaction guaranteed and reliability backed with our lifetime replacement warranty. *Includes one (1) differential Spool. **Install without the factory seal and o-rings for the correct fitment** 100% Engineered in the USA! Notes: -Use high quality tool to assemble (SpeedTek RC 1/4" speed bits or MIP) -Use red loctite on spool shaft and screw screw when installing -Re-tighten set screws on occasion to eliminate cups coming loose