Sterling Seal, inc brown viton o-ring kits are used for personal and professional workshops, garages, plumbing services, hvac & general service trucks Plastic case for portability and organized storage. Kits includes 382 pieces covering 30 most commonly used standard dash sizes. Sizes listed below BROWN VITON – EASILY IDENTIFY FROM YOUR BLACK O RINGS; Viton resists boric and citric acids, ketones, hydrocarbons, and animal and vegetable oils Sterling Seal, inc brown viton o-rings have excellent resistance to aging and ozone - low gas permeability and low compression set Sterling Seal & Supply Seals exceed the requirements of ams 7259. These seals are suitable for applications ranging from -10 to +400°f