2RS Double Rubber Seal Bearings 30x55x13mm, Pre-Lubricated and Stable Performance and Cost Effective, Deep Groove Ball Bearings DUAL-SIDED RUBBER SEAL - Double rubber seal on both sides protects the ball bearing, safeguarding its integrity, ensuring it holds together whatever structured it is holding together. 608zz Bearing 25mm 6205.2RS Sealed Ball Bearing 25x52x15 6205DDU 6205-2NSE Double Rubber Seal Bearing HIGH RPM SUPPORT - The extreme RPM support minimizes wear and tear, protecting the bearings from early failure and collapse. It comes pre-lubricated and shielded to keep the lubricant in and contaminants, dirt and debris out Features and Benefits: Robust sealed design protects against dust, dirt, and moisture; Pre-lubricated with high-quality grease for extended service life... ULTRA-RESISTANT - This ball bearing is made from chrome steel and can survive severe impacts. These bearings are designed to survive high pressure.