This Metal Diff Set is supplied pre-assembled and ready to drop into your ARRMA vehicle.Features: 0.8 module main gear for ultimate durability Precision manufactured for accurate tooth mesh Tough precision aluminum diff case ensures accurate alignment between gears High strength steel straight-cut diff internal gears and splined diff output shafts Supplied pre-assembled and ready to drop into the center of your ARRMA model Filled with 500,000cSt silicone oil Includes:1 x Pre-Assembled Metal Center Diff Set (57T,0.8M)