Ideal for hand and finger flexion exercises. Vary resistances by increasing or decreasing number of rubber bands attached to the exerciser, or by changing to a different color-coded set of bands. The range of motion may be decreased by using the flexion limiter.. Comes with a set of 25 bands, five of each color/resistance – tan (extra-extra-light), yellow (extra-light), red (light), green (medium), and blue (heavy).