This is a pack of ten 1/2" x 3/4' rubber sealed "Speed" 1/8 wheel bearings. ProTek R/C "Speed" bearings are high quality steel/chrome bearings designed for the R/C racing enthusiast. 

These 1/2" x 3/4" rubber sealed bearings are the standard bearing for the Team Losi 8ight inside wheel bearing. Please check the manual that came with your vehicle for the correct size if you are not certain.