Radio Shack XMODS 1/28 Wide Track Upgrade Set of 14 Bearings 6 Wide Bearings and 8 standard All With Metal Shields High Quality Complete set Ball Bearings for Radio Shack XMODS 1/28 Wide Track Upgrade, Set Contains Total of 14 Bearings. 6 Wide Bearings with metal shields and 8 standard size bearings with metal shields , the wide bearings goes in 6 locations, 4 in the inner and outer front wheels and 2 in the outer rear axles. This upgrade will cancel any side to side play and will make your Xmod more stable.