Our Balance set stands out with black and white bands and a striking teal accent, all coordinated around the harmonious symbol of yin and yang. Cute enough for your wrist, strong enough for your hair! Medium is the size of a normal hair tie band. It fits wrists between 5-6.4" around. Small is better for younger girls and small teens. It fits wrists under 5" around. Large is sized for wrists 6.5-7.5" Please allow 5-8 business days for shipping.