This is a slider knot bracelet that is adjustable to different wrist sizes. This picture you see it on a almost 5 year old boy and it is a little loose, but he could wear it, but it will adjust much bigger to fit maybe an even 11 or 13 yr old boy, but it is a little to small for my wrist which wears a 7". Brown Lava rock on a black leather cord. Lava Rock is very porous allowing you to apply your favorite Essential oils to them.