ABEC-5 Ball Bearings 5x9x3 Stainless Steel and Ceramic Balls Lot of 10 Bearings 10 ABEC-5 Stainless Steel Bearings with Ceramic Balls ABEC-5 quality, this is a popular size that could be used in many application that uses this size 5mm x 9mm x 3mm. Each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease.