NO SPEC. DIAMETER 1 DOUBLE TRACK DOUBLE SIDE 1100 2 DOUBLE TRACK DOUBLE SIDE 1208 3 SINGLE TRACK SINGLE SIDE 1230 4 SINGLE TRACK SINGLE SIDE 1130 5 SINGLE TRACK DOUBLE SIDE 1110 6 SINGLE TRACK DOUBLE SIDE 1050 7 SINGLE TRACK SINGLE SIDE 850 8 SINGLE TRACK SINGLE SIDE 700 9 SINGLE TRACK SINGLE SIDE 520 we can supply all range of ball race-tuantable. Any enquiry is highly appreciated