Thera-Band® latex Exercise Band - Extra Extra Heavy - Black x 46mWith Thera-Band® resistive exercise systems, measuring progress and achieving goals for fitness or therapy is easier than ever before.Thera-Band® latex Exercise Bands are available in 8 color-coded levels of resistance (please note - at present we only stock 5 strengths). Proper use of these systems for resistive exercise provides both positive and negative force on the muscles, improving strength, range of motion and cooperation of muscle groups. Color-coded progressive resistance gives at-a-glance documentation of progress from one level to the next.With Thera-Band® resistive exercise systems, measuring progress and achieving goals for fitness or therapy is easier than ever before. Different resistance levels are determined by thickness of the band. We designed the Thera-Band® Progressive Resistance System with color-coded levels increasing in difficulty from tan (Extra Thin) to gold (Max). This comprehensive system provides positive reinforcement and feedback for gauging results.Features:Strength: Extra Extra HeavyColour: BlackLength: 50yds/46m