GENUINE LEATHER: Both the upper leather and the lining leather are calfskin which is soft and comfortable keeping your favourite timepiece snug and secure protected from accidents and without aggravating your skin along the way QUICK RELEASE: This strap is equipped with quick release spring bars can be quickly removed and installed without any tools BAND LENGTH: 125mm and 75mm (not counting the buckle). Thickness:3mm to 5mm. This strap fits the wrists of 14cm-20cm (5.8”-8”) SIZE SELECTION: Available in 18mm 20mm and 22mm please accurately measure your watch lug width before ordering (please refer to figure 5 for details). Size = Watch Lug Width CLASSIC AND TIMELESS: The textured-leather strap completes the look making it the perfect accessory to smart casual attire. superior quality superlative style and totally timeless