Sterling silver ring-shaped cufflinks with a sophisticated design. (Sterling silver is a silver alloy consisting of 92.5% silver and 7.5% copper.) The design is modeled after handcuffs. - Size: 14.6mm. I tried them on a standard dress shirt sold in Japan. They fit just barely. To put it positively, you won't lose them while wearing them. - Color: Silver - Design: Ring-shaped cufflinks - Material: Sterling silver - Manufacturer: London Links Thank you for viewing.