SR133ZZ ABEC-3 Stainless Steel Ball Bearing, this is a popular size that could be used in many fishing reels or any application that uses this size 3/32" x 3/16" x 3/32". Bearing is made of Stainless Steel, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also bearing is pre-lubricated with grease.