R144ZZ Shielded Ball Bearings 1/8" x 1/4" x 7/64" 10 Bearings R144ZZ Shielded Ball Bearings, R144ZZ is a popular size that could be used in many applications, each R144ZZ bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also R144ZZ bearings are pre-lubricated with grease.