Bbb rollerboys ceramic bearings jockey wheels 10s black

10t rollerboys equipped with low friction ceramic bearings for ultra smooth glide and exceptional durability special teeth pattern for quick shifting performance lubricated with special ceramic light oil for extra smoothness composite material provided by ems swiss with 40 glass fiber mixture complete set of bushings for different shifting systems included bearing type ceramic compatible with shimano 7 and 8 speed campagnolo 8 9 and 10 speed sram 9 0 97 98 9 0sl 98 7 0 97 98 and 5 0 98 99 compatible with shimano made of grivory ems