Contraband Sports 7419 Resistance Bands, Weight Lifting Bands, Powerlifting Bands, Pullup Bands, and Yoga Stretch Bands SOLD AS A SINGLE - We sell these separate to allow athletes to purchase a single or a pair. Since there are various uses for this product, they are best sold as a single to provide the best purchasing options to all customers. MULTIPLE SIZES AVAILABLE - We offer the largest range of sizes so you can select the bands that best suit your application. COMBINE BANDS FOR MORE RESISTANCE - You can combine any two bands to increase the resistance and create a unique tension strength. RESISTANCE CHART - Check product images for a resistance chart. This will help you choose a band that will fit your application. If you have any questions, please post to this page so sellers and customers can answer. NO HASSLE RETURNS AND WARRANTY - There is a full purchase price refund within 30 days of your purchase if you are not happy for any reason. After 30 days, there is a 1yr full replacement warranty on this product for any manufacturing defect.