Outer diameter: approx. 17.8mm Thickness: approx. 3.5mm Quantity: 4 Outer diameter: approx. 15.3mm Thickness: approx. 2.9mm Quantity: 2 These items were stored, and are likely removed from used clothing. There may be scratches, but the price is the minimum, so no discounts are available. Discounts are possible for bulk purchases, so please comment if you are interested. We hope that those who are not overly concerned about minor imperfections will consider purchasing.