Berfine watch bands are all of high quality, both the upper and lining are all calf leather, also the buckle is made of thick solid stainless steel.Specification:-Meterial: Top grain genuine calf leather upper and lining-Buckle: 316L solid stainless steel buckle-Band Width: 20mm, 22mm, 24mm-Band color: Black / Dark Brown / Brown-Band length: 125/97mm ( regular length )-Wrist Fit: 6.75" to 8"-Package Included: 1*Watch Strap, 2*Spring BarsNote:The actual color of this item may be slightly different from the pictures shown on the website caused by different monitor and different batches of genuine leather. A few common compatible smart watch widths:-Moto 360 2nd Gen Women's 42mm -- 16mm-Moto360 2nd Gen Men's 42mm -- 20mm-Moto360 2nd Gen 46mm 2015 -- 22mm-Samsung Gear S2 Classic -- 20mm-Samsung Gear S3 Classic/Frontier -- 22mm-Pebble Time Round Large -- 20mm-Pebble Watch/Pebble 2 watch -- 22mm-LG Watch Style -- 18mm-LG Urbane/R/G -- 22mm-Asus Zenwatch 2 1.45" -- 18mm-Asus Zenwatch 2 1.63" -- 22mm-Fossil Q Tailor -- 18mm-Fossil Q Gazer -- 20mm-Fossil Q Founder 2.0/Marshal/Wander/Crewmaster/Nate -- 22mm-Withings Activite -- 18mm-Withings Steel HR 36mm -- 18mm-Withings Steel HR 40mm -- 20mm-Huawei Watch -- 18mm-Huawei Watch 2 -- 20mm-Huawei Watch 2 Classic -- 22mm-Vector Luna watch -- 22mm-Vector Meridian -- 22mm-Vostok Amphibian -- 22mm-TICHWATCH 2 -- 20mm-Basis Peak Fitness Tracker Watch -- 22mm-Cookoo Smart Watch -- 22mm-Martian Notifier Smart Watch -- 22mmNote that all of these are not ideal for the Moto360 first generation.