The GROW set includes five hair tie bracelets in colors representing a growing seed: soil, sun, water, sky, and leaves. The sturdy palm trees on the charm reminds us to start small and grow tall. Small is better for younger girls and small teens. It fits wrists under 5" around. Medium is the size of a normal hair tie band. It fits wrists between 5-6.4" around. Large is sized for wrists 6.5-7.5"