Flat Band & Tube Resistance Levels: Green is Light (20lbs +/-), Blue is Medium (30lbs +/-), and Gray is Heavy (40lbs +/-).
Measurements: 15"L x 4"W
Thickness: Light 0.35mm, Medium 0.45mm and Heavy 0.55mm
Measurements: Green (Light) 1/2", Blue (Medium) 3/4", Gray (Heavy) 1".
Resistance Levels: Green is Light (20lbs +/-), Blue is Medium (30lbs +/-), and Gray is Heavy (40lbs +/-).