About This ABEC-9 Precision Grade: 608RS ball bearings deliver accurate and stable rotation for a professional smooth riding experience High-Quality Bearing Steel Construction: Crafted from premium bearing steel that is wear-resistant, pressure-resistant and deformation-resistant for high-intensity extreme sports Racing-Grade Lubrication: Pre-filled with racing-grade high-speed lubricant to reduce friction and wear, enhancing rolling speed and endurance Double Rubber Sealed Design: Effectively blocks dust and water, protecting internal components and extending service life Universal Compatibility: Standard 608RS size fits kick scooters, pro scooters, inline skates, skateboards and similar equipment Overview Brand : Limit Material : Carbon Steel Item dimensions L x W x H : 0.87 x 0.31 x 0.87 inches Item Weight : 12.2 Grams Bearing Number : 608RS