TheraBand tubing is made of natural rubber. Resistance levels, obtained by varying the thickness of the tubing, are color-coded in proprietary. TheraBand colors increasing in difficulty through seven levels from tan through silver. The color-coding system provides positive reinforcement and feedback for gauging results.
25 foot roll.
Resistance Levels:
Tan – Extra thin
Yellow – Thin
Red – Medium
Green – Heavy
Blue – Extra heavy
Black – Special heavy
Silver – Super heavy