SR144ZZ ABEC-5 Ball Bearings Stainless Steel and Ceramic Balls 1/8"x1/4"x7/64" inch Lot of 10 Bearings set of 10 SR144ZZ Stainless Steel Bearings with Ceramic Balls ABEC-5 quality, it is a popular size that could be used in many application that uses this size 1/8" x 1/4" x 7/64", each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease.