Feature: 1. Made from environmentally friendly elastic latex, durable and stretch further. 2. 4 exercise bands with different thickness and tension: Purple 0.5mm (10-15lbs), Pink 0.7mm (15-20lbs), Blue 0.9mm(20-30lbs), Grey 1.1mm (30-40lbs). 3. You can combine the resistance bands by stacking or knotting together to achieve different resistance levels for your workouts. 4. Improve muscle tone in arms, legs, back and buttocks, suitable for yoga, Pilates, working out, stretching and physical therapy, etc. 5. Comes with a black sack for easy storage and carrying, convenient for home, office, gym, traveling, outdoor, etc. Specification: 4pcs resistance bands set, made with high-quality latex material, elastic, durable, and environmentally-friendly. Each band features different colors, thickness, and resistance, allowing you to try different workout difficulties and chanllenge yourself. The bands are lightweight and come with a storage bag, very convenient to carry and practice anywhere you go. Features: Made from environmentally friendly elastic latex, durable and stretch further. 4 exercise bands with different thickness and tension: Purple 0.5mm (10-15lbs), Pink 0.7mm (15-20lbs), Blue 0.9mm(20-30lbs), Grey 1.1mm (30-40lbs). You can combine the resistance bands by stacking or knotting together to achieve different resistance levels for your workouts. Improve muscle tone in arms, legs, back and buttocks, suitable for yoga, Pilates, working out, stretching and physical therapy, etc. Comes with a black sack for easy storage and carrying, convenient for home, office, gym, traveling, outdoor, etc. Specifications: Material: Latex Size: 600 * 50mm / 23.6 * 2.0in Thickness & Tension: Purple: 0.5mm (10-15lbs) Pink: 0.7mm (15-20lbs) Blue: 0.9mm(20-30lbs) Grey: 1.1mm (30-40lbs) Package List: 4 * Resistance Band 1 * User Manual 1 * Carry Bag Package List: 4 * Resistance Band 1 * User Manual 1 * Carry Bag