R35 'MIAMI' Alligator Grain on Genuine Cow Leather strap has a matt finish with no stitching. When you purchase a RIOS1931 watch strap you are acquiring a high quality crafted product. The combination of traditional, handcrafted perfection while constantly evolving has made the watch straps of RIOS1931 a unique, top quality product. These straps are available in an assortment of sizes ranging from 12 to 20 mm as well as colours: white, black, dark brown, tan and blue. Select the size and colour that best suits your needs. Thickness of strap: (approx) 2.0mm to 2.0mm. Cross Section: block. Lug/Buckle Measurements: 12/10mm, 14/12mm, 16/14mm, 18/16mm, 20/18mm.