Goods will be shipped, so cannot cancel your order and return, refund will accept you can not be accommodated so please be aware before buying. ■ Using a new material stainless steel rust resistant on the market. It also contains nickel. The less, but its your melt is extremely safe, even for people with metal allergies. The wear on the Material: Surgical Stainless Steel Case (316l) ■ ■ PDV coating: no ■ Outer Diameter: Approx. 20.5 mm/inner diameter: Approx. 13.7 mm, Thickness: Approx. 1.9 mm Weight: Approx. 2.7 G ■ Optional (paid) for your monkey included with laser engraved on both sides. ■ You can ensure the engraved anniversary or a childs birthday anniversary etc so on. ■ ★ Maximum number of engraving space in case of: approx. 45 characters (alphanumeric half-width instruction manual included) ■ About 30 characters if youre looking for. ■ ★ chains are sold separately.