Latex free resistive exercise Val-u-Tubing is color-coded in Berry Colors. Latex free Val-u-Tubing is an economical exercise tubing; same great quality as CanDo exercise tubing; available in 25' bags and 100 foot dispenser boxes; Levels range in order of resistance from least to greatest resistance: pear (0), peach (1), orange (2), lime (3), blueberry (4), plum (5), mushroom (6), pineapple (7).