This is a pack of ten ProTek R/C 1/4x3/8x1/8" Metal Shielded Flanged "Speed" Bearings. ProTek R/C "Speed" bearings are high quality steel/chrome bearings designed for the R/C racing enthusiast. These 1/4x3/8x1/8" metal shielded flanged bearings are used in a variety of applications. Please check the manual that came with your vehicle to determine the correct size if you are not certain.
ProTek R/C is an AMain Sports & Hobbies brand.