Abec11 Biltin bearings are the first precision bearing designed for skateboarding by World Champion Skateboarder, Chris Chaput. They make your life faster and easier by integrating speed rings and spacers into every bearing. There is no frustration caused by dropping the washer or spacer in the dirt, searching for it; then once found, trying to get it perfectly clean so grit doesn't get into the assembly. Your locknuts can be tightened snuggly without pinching or binding the bearings. They align themselves perfectly on the axle and in the wheel. As a result, your wheels spin faster and longer and with less vibration and friction. There is no rattle from misaligned bearings. Biltin's unique design helps to share the sideloads more evenly for longer wheel and bearing life. Biltins make wheel swapping a breeze and are easier to clean. Specs: Abec Rating: 7