Non-slip texture Design: Upgraded anti-slip chequer design provides superior grip and stability, ensures the assist bands stay in place during exercises, preventing slipping or rolling up Durable and Quality Pull-up Bands: LEEKEY Resistance bands are made of natural latex material , which is strong wear resistance and can withstand extreme tensile force. You can train without any worries of tear or wear Good for Stretching and Resistance: Our resistance bands work for anyone need stretching out those sore achy muscles after a workout and stiff ones for before the workout. You can use them to stretch out before deadlifts and squats Multi-Functional Resistance Bands: Resistance bands can used for multiple exercises, such as strength training, assisted pull-ups, basketball tension training, warm-ups etc 4 Resistance Bands Levels: Pull up assist bands come in 4 resistance levels, and each color is different resistance and width for different purposes. Red Band (15 - 35 lbs) ; Black Band (25 - 65 lbs); Purple Band (35 - 85 lbs)；Green (50-125lbs)