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1/8" CERAMIC NITRIDE PRO SERIES BALLS - made from pure Si3N4 Silicon Nitride - 12 ceramic balls per pack

These are the metric equivalent of 3.175mm Ceramic Silicon Nitride Balls

Note: these 1/8" Silicon Nitride balls are being used successfully in competitive bicycling or as differential balls. Specifically they can be used in Shimano pedals model #s 7401, 6402, 6401, 1056, M731, M525 as well as Campagnolo triple bearing system pedals, Mavic headsets and some freewheels.