Thera-Band latex Exercise Bands are available in 8 color-coded levels of resistance. Use of these systems for resistance exercise provides both positive and negative force on the muscles, improving strength, range of motion and cooperation of muscle groups. The Progressive Resistance System is designed with colour coded levels increasing in difficulty from TAN (Extra Thin) to GOLD (Max). A portable and versatile product with virtually unlimited uses. Available in a 6 YARD and 50 YARD dispenser boxes.