20mm for Omega Nylon Canvas Strap Seamaster Ghost Party Speedmaster Watch Strap Features: 1. Easy to install and remove, stylish, soft and comfortable to wear. 2. Easy to install and remove. 3. Perfect replacement strap for your watch. 4. Free to install and remove the wire strap by hand only. Specification: Material: Nylon Size: Curved Mouth 20MM Length: 300mm Package Included: 1*Strap(watch not included) Note: 1. Due to manual measurement, please allow 1-3mm error. Please make sure you don't mind before ordering. 2. Due to different lighting of photos and differences in monitors, the pictures may not reflect the actual color of the object. Please make sure you don't mind before ordering, thanks