This striking biker bracelet sports free moving .925 sterling silver skull beads on black braided leather. Leather is approximately 4 mm in diameter. An 8" bracelet weighs approximately 18 grams. Nifty little bracelet at a nifty little price! Sizing: To get the perfect fit, I recommend measuring the circumference of your wrist then adding an inch (2.5cm). That should give you the perfect bracelet length.