HP Reel Bearings Ceramic Hybrid Kit includes = Two 3x10x4mm Bearings Material = Ceramic Hybrid Ball Bearings with grade 5 Si3N4 Silicon Nitride ceramic balls HP Reel Bearings is dedicated to supplying the consumer with the highest grade high performance reel bearings on the market at the best price around. All of our bearings are made from high quality stainless steel and ceramic Si3N4 silicon nitride balls. All bearings come without shields and pre-lubed.