Different colors with different thicknesses, fit for different strength training. The thicker, the price is higher. Made from 100% natural latex, non-toxic and odor-free, and also elastic and durable. This resistance band set can be integrated seamlessly with every popular workout program including Yoga, Pilates, and more. Or use them for general exercise, stretching, strength training, power weight programs. It is easy to take your bands and do any workout away from home.