Multi-piece resistance bands set for building muscle mass or shedding fat * Includes 1 low-, 1 medium-, 1 high-, and 1 ultra-high-strength resistance band * Door attachment lets you create more than 100 upper and lower body exercises * Unique metal clipping system for attaching to soft-grip handles or ankle straps * All 4 bands clip together to create up to 50 pounds of resistance; includes pouch