PROIRON Resistance loop bands are suitable for people of all fitness levels, they are ideal to work muscles throughout the whole body progressively and safely. Use any one band individually or multiple bands together to provide the right level of resistance for you. This Exercise bands set contains 5 latex bands with different stretching weights, Yellow-10 pounds; Green-20 pounds; Blue-30 pounds; Red-40 pounds Black-50 pounds. They are 50mm wide and made from natural latex. PROIRON Exercise bands are great Yoga, Pilates & Home Fitness and ideal for increasing strength and mobility. The use of resistance bands can help to strengthen stabilising muscles which may help to prevent injury or assist greatly in injury rehabilitation. Our resistance loop bands can be stretched repeatedly year after year and are made from natural latex material which is friendly to the environment. It is easy to carry to any place and any time you want. The exercise bands fit easily into the carry bag provided.