Specification： Color: green, blue, yellow, red, black Applicable scenarios: fitness equipment, hiking and camping, sports protective gear accessories, cycling sports, sports trends, sports outdoor bags, fitness body, venue entertainment equipment, health massage Material: Latex Size: 600 * 50 * 0.35MM Specification of tension belt pounds: Green: 10lb Blue: 15lb Yellow: 20lb Red: 30lb Black: 40lb Purchase suggestion: Men: Rehabilitation training: Green: 10lb. Novice fitness: 15lb. Basic training: Red: 30lb. Advanced training: Red: 30lb. Strengthened: Black: 40lb. Woman: Rehabilitation training: Green: 10lb. Novice fitness: 15lb. Basic training: Red: 30lb. Advanced training: Red: 30lb. Strengthening: Red: 30lb. Notice: 1.Please allow 1-3.0Mm error due to manual measurement. pls make sure you do not mind before your purchase. 2.The colors may have different as the difference display,pls understand. 3.Please leaving a message before you give the bad feedback, if the products have some problems.