World Champion ACER Racing Ball Bearing Kit for the Traxxas Summit This is for the 1/10 Summit. It contains the following bearings: 16 pc 5x11mm ball bearings 12 pc 6x12mm ball bearings 4 pc 6x13mm ball bearings 5 pc 5x8mm ball bearing 4 pc 12x18mm ball bearings 2 pc 8x16mm ball bearings Lubed with 100% synthetic ACER Racing ACERGoo for super smooth, fast action, and lower bearing temperature. Uses lightweight Grade 10 HCCA ultralite balls. Feel the difference and race faster, longer with these lightweight, fast and extremely durable bearings. Also available in ceramic under a separate listing.