PATENTED WALL ANCHOR SYSTEM: For accommodating resistance bands for arms and shoulders, legs, ankles. Can be used in home or commercial settings. The 3 foot rail/track is made of high-grade aluminum. The stainless steel rail cars are reinforced with a nylon and fiberglass mix for extreme durability IDEAL USE: Replicates more expensive physical therapy and home gym equipment. Ideal for use by athletes, fitness enthusiasts, and physical therapy providers and clients