Furinno Rfitness Professional Flat Stretch Exercise Band 3-PC Set, RF1502-3 Professional strength - highly durable with superior tearing/snapping resistance Versatile, adaptable to multiple fitness levels from beginner to advance level. Our 5.5-Ft long flat bands can be Doubled up or used together to increase resistance Colored exercise wall chart included with 21 categorized exercises for a full body workout. Please follow instructions when exercising to avoid injury Lightweight and perfect for travel RESISTANCE in lb-force at 100% to 300% elongation: Red - 3.3 to 7.5 lbs; green - 4.6 to 9.7 lbs; black - 7.9 to 15.4 lbs