Description:Titanium is a lustrous transition metal widely used by the aerospace industry due to its ability to withstand the harsh condition of outer space. It has also become popular with medical manufactures since it is completely non-toxic to the human body and can be safely implanted in the body. Made of High Quality titanium alloy material, lightweight but stronger than steel, lifetime using, high hardness, high loading-bearing.Great for hang your keys inside or outside your pocket, pouches and bags.Easy to add and remove keys.Features:1. Made of titanium alloy, high hardness, solid and reliable, stable and not easy to rust.2. Titanium is beneficial to human body and quite safe.3. Resistant to corrosion, durable, hypoallergenic and non-magnetic.4. Easy to add and remove keys.5. Perfect choice for outdoor camping, hiking, mountaineering etc.Specifications:Material:Titanium AlloyColor:as show in the picturesWeight:approx. 4g Diameter: approx. 29mm / 1.14inchThickness: approx. 3mm / 0.11inchPackage Included:1 x Octagonal Ring KeychainNotice:1. Please allow error due to manual measurement. Thanks for your understanding.2. The keychain has limited elastic, it is easy to deformation if you pull it too hard.