Specifications: The key ring has is aesthetically superior, with an 8-sided outer geometry, while maintaining a smooth circular inner curve. This will help keep the keys moving freely without getting caught at an angle. The ring design also allows for a push-pull motion in opening the ring, rather than prying the fingernails in your hands. You can open these keychains even while wearing gloves, and people with arthritis will also find this keychain more convenient to use. This design is not intended to replace the original key ring, simply because it cannot be mass-produced, but nevertheless, it serves as a proof of concept, investigating the usefulness (pro i cons, status qu) and how we can improve the existing design, the accessory that we use daily. Features:Material: TC4 Titanium Size: Outer Diameter: 20mmInner Diameter: 16mmThickness: 3mmIncludes:1X TC4 Ti Titanium Keychain