Valeo’s set of three 4-foot stretch bands provide 3 levels of resistance – yellow for light, red for medium, and blue for heavy. Flat latex bands have a smooth consistent stretch. Use to strengthen, tone, shape and rehab muscles and improve range of motion. Exercises included.This set of three Stretch Bands from Valeo offer variable resistance levels that allow you to stretch, strengthen, and tone your muscles with the included exercises. Each band measures 4 feet long and features durable latex construction that offers a smooth and consistent stretch. Each band is color coded for ease of use. The yellow band offers the lowest resistance. The red band offers medium resistance. The blue band offers the heaviest resistance. These resistance bands are lightweight and highly portable.