CNC machined solid aluminum, anodized redTaper Cut to reduce rotating mass and increase accelerationAllows for better accelerationReplaces differential spider and side gears (Arrma AR310436)Only fit 31mm front, center, or rear (there is no center differential in LimitLess)Suitable for:1/8 Arrma Kraton , Notorious , Outcast , Senton , Talion , and 1/7 LimitLess InFraction, 1/10 Senton . Fits the front, center, or rear differential. See vehicle model compatibility in comments below.InFraction ARA109001Kraton: AR106005, AR106015, AR106018, AR106029/31 (red/green), ARA106040T1/2 (red/blue)LimitLess ARA109011Notorious: AR106034/6 (black/blue), ARA106044T1/2 (black/blue)Outcast: AR106021, AR106027, AR106032/3 (silver/orange), ARA106042T1/2 (silv/org)Senton: AR106007, AR102654, AR102673Talion: AR106003, AR106014, AR106030 (2018 V3 model), ARA106048 (V4): AR106001, AR106013, AR106028, ARA106046Colour:3:redMaterial:Aluminum alloyPackage Contents:2 x RC Car Differential Locker SpoolOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.