This is a set of two XRAY 5x12x4 Clutch Bell Bearings, and are intended for use with the XRAY XB808, and XB808 09 Spec 1/8 buggies, as well as any other application that requires a 5x12x4mm bearing. These bearings replace the standard 5x10 bearings with 1.3mm balls. The oversized 808 clutchbell ball-bearings are 5x12 with 2.0mm balls and extra-thick bearing walls. This translates to higher load-carrying capabilities which will increase the life of the bearings and reduce the risk of clutch bearing failure during long final runs. The bearings come with special high-temperature resistant grease to ensure proper lubrication during high-revving engine operations and long runs.