These Resistance Loop Bands are an excellent method of strength training for the development of specific muscles and tendons. Designed for rehab and training exercises, they can be used to add variety to standard workouts. Lightweight and portable, the loops can be easily transported, offering an alternative to large and heavyweights. Resistance Loop Bands can be utilized for targeted rehab work, physical therapy, mobility training, or countless everyday exercises to strengthen the legs, glutes, core, arms, back, and more. Theyre made from highly durable latex and are optimized for short, limited movements. Materials:Top quality natural Rubber Latex. Size1: 500mm Circumference; 50mm Width. Size2: 600mm Circumference; 50mm Width. Thickness: Yellow: 0.35mm Red: 0.5mm Blue: 0.7mm Green: 0.9mm Black: 1.1mm Package Included: 5 x Resistance Band. 1 x Carriage Bag. Color: Yellow/ Blue/ Red/ Black/ Green(Different colors, different thickness and strength)