Suprfit Strength Bands are enormously helpful for functional training. In the area of gymnastics, the Suprfit Strength Bands are often used as aids for pull ups or dips. Especially for butterfly and kipping pull ups they help as long as the necessary strength is missing and the right technique is not yet in place. In weightlifting, heavy strength bands are used to increase resistance during the deadlift or bench press. The Strength Bands of our house brand Suprfit are enormously resistant and durable. Suprfit Strength Bands have a total length of 41 inches, which is 102.5 cm. Suprfit Strength Bands are made of latex and therefore a natural product, which is why slight color variations are quite possible. The color gradations of the different resistances may change from time to time. Furthermore, natural products can wear out over time. Such wear and tear can cause the Strength Bands to tear in the long run. To prolong the life of the bands, we recommend only proper handling of these bands. Extra Light (Red): 2.2 kg (25% stretch) to 22 kg (200% stretch) Light (Black): 4.5 kg (25%) to 27 kg (200%) Medium (Purple): 11 kg (25%) to 36 kg (200%) Strong (Green): 22 kg (25%) to 54 kg (200%.