6901-2RS ABEC-5 Ball Bearing Stainless Steel and Ceramic Balls 12mm x 24mm x 6mm 6901-2RS Stainless Steel Ceramic Balls ABEC-5 quality Ball Bearing, this is a popular size that could be used in many application that uses this size 12mm x 24mm x 6mm, each bearing has 2 Rubber Seals to protect the bearing from dust or any possible contamination, also bearing is pre-lubricated with grease.