This is a pack of ten 10x19x5mm metal shielded "Speed" 1/8 wheel bearings. ProTek R/C "Speed" bearings are high quality steel/chrome bearings designed for the R/C racing enthusiast.ProTek R/C is an A Main Hobbies brand.
These 10x19x5mm metal shielded bearings are the standard bearing for the inside hubs on the Thunder Tiger EB4 S3 buggy and some 1/8th scale on-road hubs. We offer these in metal shielded versions as some racers prefer these over the rubber sealed bearings. Please check the manual that came with your vehicle for the correct size if you are not certain.