This is a pack of ten 6x10x3mm metal shielded "Speed" steering post bearings. ProTek R/C "Speed" bearings are high quality steel/chrome bearings designed for the R/C racing enthusiast.
These 6x10x3mm metal shielded bearings are the standard bearing for the 1/8th scale buggy steering posts. Please check the manual that came with your vehicle for the correct size if you are not certain.
