Features of the TheraBand Exercise Band: 5½" band width. Provides a system that allows safe improvement muscular strength and endurance, range motion flexibility. Six resistance levels to fit any therapy need. Ideal for building upper lower body rehabilitation or fitness. Uses Thera-Band Bands include: exercise, gym, balance, fitness, birthing, yoga, pilates, stability resistance. The use elastic rather than weight-bearing exercises minimizes pressure on joints decreases possibility incurring other injuries. Bands can be used while traveling, sitting at home even in office. Also available as 50 yd. roll (Item# HYG-20140). As each level is mastered, increased with ability. general, tan yellow are early very frail individuals. most common resistances red, green & blue. Black, silver gold typically by athletes.