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10x15x4mm rubber sealed "Speed" wheel bearings. ProTek R/C "Speed" bearings are high quality steel/chrome bearings designed for the R/C racing enthusiast.

These 10x15x4 rubber sealed bearings are the standard bearing for Xray hubs and 1/8th scale on-road hubs. Please check the manual that came with your vehicle for the correct size if you are not certain.