3 RESISTANCE LEVELSResistance bands come in 3 different resistance levels: Blue Band (Light, 5-10 lbs), Green Band (Medium, 10-15 lbs), Gray Band (Heavy, 15-20 lbs). Different resistance levels meet the workout needs of both beginners and experienced athletes. HIGH-QUALITY MATERIALSStretch bands are 59 inches4.9FT long and 6 inches wide, made of high-quality TPE material, latex-free, skin-friendly, odorless, smooth surface, safe and durable, can maintain long-term elasticity, not easy to break.