Ravin Serving Fluid. These Bow Tuning & Archery Accessories produced by Ravin are odor-free and waterproof for optimal performance. This Ravin Serving Fluid is a non-wax polymeric lubricant that protects and conditions your bowstring and serving to ensure a longer lifespan and reliable performance with every use of your crossbow. You should apply this fluid to your serving and string at least once a year or before taking it out in freezing temperatures. Pick up some Ravin Serving Fluid to keep your weapon in pristine condition. Specifications for Ravin Serving Fluid: Manufacturer: Ravin Weight: 0.2 lb Features of Ravin Serving Fluid Non-wax polymeric lubricant for applying to the center serving of string Odor-free and waterproof Should be applied at least once a year or before use in weather below 32 degrees F. Package Contents: Ravin Serving Fluid The Ravin Serving Fluid is a quality addition to the Ravin lineup. For more great deals on Bow Tuning & Archery Accessories by Ravin please browse our Ravin Archery Equipment page. Ravin R280: Serving Fluid