ABWP-SSBF200 Series is an Anti-Bacterial Waterproof Plastic Four Bolt Mounted Bearing with Reinforced Plastic Polymer Housing and Polymer Protection Caps. Both Housing and Protection Caps contain an Anti-Bacterial Additive Effective Against Food-Borne Viruses. Seal and O ring made with NBR Rubber. Viton Rubber offers High-Resistance to Chemical Agents, Avaliable with Request. Grease Nipple in Stainless Steel AISI 304. Seamless Bushings on Bolt Holes.