6708-2rs Sealed Metric Slim Bearing 40x50x6mm6708 2rs Sealed Ball Bearing 40mm x 50mm x 6mm 6708 2rs Sealed Ball Bearing, Bearing inner diameter is 40mm, Bearing outer diameter is 50mm and Bearing width is 6mm, 6708 2rs bearings is a popular size that could be used in many RC Cars and Trucks, made from durable 52100 alloy steel, commonly known as chrome steel, each bearing has 2 rubber Seals to protect the bearing from dust or any possible contamination, plus its pre lubricated with grease so