Our "Wonder" set includes five hair tie bracelets in gorgeous light neutrals. You will find pearls, golds, and silvers to make this set mix well with any other jewelry. A moon and stars on the charm will keep our sense of wonder alive. 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".