Our Hope set includes five hair tie bracelets in comforting pinks. The silver heart charm has a breast cancer ribbon to show our support to the cause. A portion of the proceeds will be donated to the Susan G. Komen foundation. 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.