The Chupacabra RDS is one of the most advanced deployment systems on the market today. It's extremely reliable, light weight, and low bulk for easy stashing after removal. Each system comes with 4 rings and the lines needed to attach your d-bag and bridle to the slider. Our proprietary stainless steel rings are custom made for weight [lightest on the market!], reliability and to reduce wear on the line kit. Stainless steel is necessary for use with Vectran lines. Other, softer materials currently in use are not suitable because they transfer metal to the lines, groove and create sharp edges very quickly.