DoubleFF Swiss ceramic black ball 2.0

These bearings are manufactured with 7 balls. The theory behind this is that the slightly smaller diameter of the 7 balls ensures that you can easily get up to speed and that the total weight supported per ball is less than with the "6" ball bearings. The balls are made of black ceramic material, making them even harder than the white ceramic balls and also rust-proof. Please note: the shell is made of steel, meaning cleaning is still necessary after skating in the rain. The advantage of ceramic balls lies mainly in the fact that they are less likely to seize up and wear out less quickly. They are open on one side so that the bearings can be cleaned perfectly, and on the other side they have a removable shield (partly steel/partly rubber). These bearings are packed per 16 in a robust but handy aluminum tube. The bearings do need to be oiled. You need 2 bearings and 1 spacer per wheel.