Features: 1. Carbon Steel Material 608-2RS ball bearings 2. 608-RS Bearing with rubber sealed Shields on both sides to keep lubricant in and contaminants out. 3. 8mm x 22mm x 7mm 4. Wide Application such as skateboards, inline skates, scooters, Longboards, Roller Skates or other skating applications moderate Load Use. 5. 608-RS with both side rubber shields, it also call 608-2RS. Including: 4pcs 608-RS ball bearings