Latex free Sup-R Tubing® is the ONLY brand exercise tubing you'll ever need because it performs like latex with the non-allergenic properties of latex-free. Tubing is available in 8 resistance levels. Levels range in order of strength from least to greatest resistance: tan, yellow, red, green, blue, black, silver, gold. Resistance exercise tubing has become a staple of many physical therapy and athletic training programs. It is an economic solution for upper and lower body exercise. It is lightweight, portable and durable. Effective when used alone, or with handles and anchors. Simply unroll desired length of exercise tubing and cut with scissors.