Country Brook Design 25 Nylon Replacement Collar for Dog Fence Receivers Customizable length allows you to adjust to the perfect fit. When we ship it to you, it is sized 1 inch wide and stretches out to 30 inches long. Once you receive the product, measure your pups neck and cut to length. Features two holes for collar systems. This design can be used with Petsafe models: IF-100, RFA-48, RFA-41, PIF-275, PIF-275-19 , PIF-300, PUL-250, PUL-275, PIG00-13737, PRF-275-17-19,PRF-3004W, PRF-304W, PIG00-14673, PIG00-13661, PIG00-14582, PIG00-10777, MIG00-10939, MIG00-10938, ZIG00-1465. The silky soft nylon will wear like a hug, all while giving you the assurance of strength and durability. Made with a plastic buckle and triglide, this collar does not have any metal. If you have any questions, please give us a call at (256)974-0700