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Quantity: 8 balls in a set Is customized: Yes Type: Bearings Material: Bearing steel/Nylon/White Ceramic Color: Red Type: Hybrid White Ceramic Bearing Suit F: Inline Skate/ Skateboard / LongBoard Rolling elements:7 White ceramic Beads(ZrO2), High Temperature and Corrosion Resistance,Abrasion resistance,High Revs. bearing ring:High Quality bearing steel Cage :Nylon ,The material is suitable for highly corrosive environments or high speed scene. (The Cage color has Brown and white, it is the same) Shield:two-sided dust cover Size: 8 * 22 * 7 (Inner * Outer * Height) / Unit: mm Limiting speed: 22,000 rev / min