Include a extra nylon strap. Model:SF746S Movement:Japan VH60 Quartz Movement Case Material:Bronze Back Material:316L Stainless Steel Back Cover:Screw-down Back Case Diameter:39mm Case thickness:12mm Lug To Lug:49mm Strap Width:20mm Strap Material:Rubber Strap/Leather Strap Mirror Material:Sapphire Mirror+AR Coating Mirror Size:34.01.8mm(DiameterThickness) Crown Style:Screw-down Crown Crown Diameter:10mm Luminous: C3/BGW-9 Luminous Water Resistant:200m.