1.Purple:15 - 45LB adjustable for beginners Red: 20 - 60LB adjustable, suitable for beginners with basic skills. Blue: 30 - 85LB adjustable, suitable for regular exercisers Black: 40 - 110LB adjustable, suitable for adult men who work out regularly Green: 50 - 150LB adjustable, suitable for adult men who work out professionally. 2.[Versatile & Adjustable Resistance]- The Adjustable Resistance Band Chest Exerciser is designed to provide versatile strength training for chest, back, and arm muscles. The resistance can be easily adjusted to suit your workout needs, making it a perfect home exercise equipment for all fitness levels. 3.[ & Comfortable Material]- Constructed with high-quality TPE elastic tube, nylon strap, and plastic components, this chest expander is designed to withstand regular use and last longer. The soft, non-slip material ensures a comfortable and secure fit during your workout. 4.[Variety of Colors]- Available in 5 vibrant colors to match your style, this chest exerciser is not only functional but also visually appealing. Choose your favorite color and make your workout more enjoyable.