The Kwik Swiss Nitride Bearings s an evolutionary bearing. The materials this bearing is made with are of higher quality than any other bearing out there. This bearing has the revolutionized Alloy ball bearings in it to increase the amount of roll and the distance this bearing will roll. These ball bearings are also coated with a thin layer of Titanium Nitride, this gives these bearings an increased life span. This coating does not chip and will give you a faster roll that you will notice. Check them out today!