This piece is made of polished Tiger's eye stone in size 6mm.Silver embellishments are Hematite stone which is coated. Bracelet is adjustable in size. It has adjustable macrame knot that makes the cord slide trough and expand in size.Material of the cord is black nylon. Soft for the skin and safe to get wet. Great quality and durable cord. Thickness is 0.5mm.*note: IF you have any questions regarding this product, please don't hesitate to ask.