DESIGN: Helps increase strength, flexibility, power, and stamina Extra-strong closed-loop design Ideal for heavy-duty use Versatile tool, great for on-the-go use Use during squats, lunges, shoulder presses, and more Light (1/2"), Medium (3/4"), Heavy (1") Exercise Guide included MEASUREMENTS: Green (Light) 1/2" Blue (Medium) 3/4" Gray (Heavy) 1"