This is an MIP X-Duty 16mm x 5mm Drive Hub for the Traxxas Slash and Slash 4x4.
1x MIP Confetti Sticker, 2.185 x .65 Black
2x SHSS, M4 x .7 x 5mm Cup Point
2x MIP M4 Pin Screw, Slash Diff Outdrive
1x MIP Bearing Spacer, Rear, Traxxas Slash/Slash 4x4
1x MIP X-Duty, Drive Hub, 16mm with 5mm Bore