Theraband tubing, silver, 100 feet, dispenser box Tubing is made of natural rubber. Resistance levels, obtained by varying the thickness of the Thera-Band® tubing, are color coded in proprietary Thera-Band® colors increasing in difficulty through seven levels from tan through silver. The color-coding system provides positive reinforcement and feedback for gauging results. Product photo may not exactly match the product offered for sale. Please refer to the product description.