Legendary Bones Swiss bearings have been the industry standard ever since they were introduced in 1983, and are still a favorite with professional skaters. Fast, smooth, and very long lasting, they remain unequaled in their class. Bones Swiss feature the same ultra high performance components used in Bones Swiss Ceramics, except that the balls are polished chromium steel instead of ceramic. Bones Swiss have earned their fame through decades of proven, dependable, superior performance for the best skaters in the world. No hype, (ABEC-99!) just the best... ask anyone who has been skating for a few years.