R408 "WAGING"- Genuine Certified Organic Leather watch strap, with stitching that matches the colour of the strap. When you purchase a RIOS1931 watch strap you are acquiring a high quality craft product. The combination of traditional , handcrafted perfection while constantly evolving has made the watch straps of RIOS1931 a unique, top quality product. R408 "WAGING" watch straps are available from 18mm and 20mm in black, dark brown, tan. Thickness of strap: (approx) 3.5 to 3.5 mm. Cross Section: square. Select the size and colour that best suits your needs. Lug/Buckle Measurements: 18/16mm, 20/18mm.