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Ceramic Premium Inline Skate & Skateboard Bearings are the new Holy Grail! Silicon Nitride (Si3N4) Ceramic Balls are suitable for applications where high loads, high speeds and extreme temeratures are factors. In ball form, ceramic is also harder than steel and because ceramic balls are non-porous they are virtually frictionless. and capable of spinning faster than steel balls. Our Premium Series are ABEC #3 & 5's and gauranteed to roll faster and smoother than your stock Ceramic Premium Inline Skate & Skateboard Bearings.