Screws / Hardware / Bearings > Zip-Ties, Velcro Straps > 20x27x4mm Bearing Black Rubber (Tighter Seal)

20x27x4mm Bearing Black Rubber (Tighter Seal)

Black rubber seal ball bearings. A step above blue-seal bearings, black-seal bearings offer an even tighter seal for ultimate protection and less maintenance in dirty environments.