STRONG - deep groove raceways for lateral stability - premium 52100 chrome alloy steel heat treated for performance and durability CLEAN - blue non-contact rubber seals and stepped inner races are a strong defense against dirt and debris - skate more, clean less FAST - precision honed races and balls paired with a polymer cage and synthetic gel for incredible speed SMOOTH - Sonic synthetic gel and polymer cage dampen noise and vibration - shock absorbers for your skates PREMIUM - made in Taiwan using steel and components imported from Japan - consistently high quality Higher precision 608 bearings - manufactured to even tighter tolerances SERVICEABLE - removable rubber seals for easy cleaning and lubrication LIGHT - polymer cage weighs less than a metal cage Sonic SuperSonic Abec 7 Bearings (608), Blue MS1165358 MS1165358 756395100077