The greatest thing since sliced bread. Its a bracelet that acually holds your hair elastic. Pull off the elastic, put your hair up for yoga, no stupid dent in your wrist and voila, you still have on a great looking bracelet. Is that cool or what?! Alloy blend with electromagnetic plating. . Bracelet measures 2.5" x 2" and fits wrists with a circumference of 5.75" to 6.75". Includes 1 black elastic, and comes in box.