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Bones Ceramic Super REDS are lighter, and provide faster acceleration, because the balls weigh much less. They create less friction and are thus faster than Super REDS, with or without lubricant! When you get dirt into your ceramic Super REDS, the ceramic balls will help to re-polish the steel races flat again, providing a self-healing benefit because ceramic balls are so much harder than steel. Finally, ceramic balls wont rust, further lengthening their life.
Skate Rated™ - Skate Rated bearings are engineered and tested by Bones Wheels to withstand the high impacts of hard landings and the high side loads of turning. These bearings roll faster and last longer than bearings that use the ABEC rating system. To give Skate Rated bearings an ABEC rating would ignore all the improvements Bones has made over the industry standard. Skate Rated bearings are specifically designed for skateboarding, not electric motors.
Ceramic - Ceramic bearings are lighter than steel bearings and roll smoother with less friction. Ceramic bearings also resist dirt and moisture better than steel, but aren't completely waterproof.