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XD-15 is a nitrogen infused steel material that will not rust or corrode. Even running in salt water or any caustic nutrition drink you can spill, it will not be degraded or affected. Even dirt or sand inside will not wear it out; this will simply polish the races smoother.

Ceramic bearings are more susceptible to water damage than non-ceramic. Hence the combination of XD-15 steel casing with ceramic grade bearings ensures bearings are not susceptible to the normal water damage and thus last much longer than normal bearings.

Bearing ID 17
Bearing OD 30
Bearing Thickness 7
Manufacturer Number 6903
Material Steel