... the super thin extra light series ball bearings are specifically designed for applications where space ... 6900 series, it provides better loads. Sealed bearings may be obtained with light, standard or heavy ... Lubricated with a good grease, the sealed bearings can have better operational and lift performance.Model ... ball bearing, Z, ZZ, RS, 2RS, 2RZ Ball bearings snap ring: N, NR Tolerance: ABEC-1, ABEC-3 ...