Package & Size : 10pcs 608-2RS ball bearings Size : 8x22x7mm, rubber sealed deep groove. Material: Carbon steel, durability and resistance to deformity under heavy loads. Widely Use : Motor,skateboards, inline skates, scooters or other skating applications etc Our 608-2 RS bearings Shields on both sides keeping lubricant in and contaminants out. Attention : We Used some rust protection oil on the bearings,if you dont want the bearings get rusty pls do not put it on the damp place.also when use you’d better use gloves to touch the bearings to prevent it get rusty, as your finger with sweat. Features Carbon Steel Material Double Rubber Sealed for lubrication Single-Row Bearing Package Included: 10 Pack Specification Inner Diameter: 7mm Outer Diameter: 22mm Height: 8mm Application Moderate Load Use: skateboards, inline skates, scooters, roller etc