Movement type: Seagull ST1701 automatic mechanical movement Case material: 316L stainless steel Case technology: polishing Bottom cover material: 316L stainless steel Bottom cover type: screw-in bottom cover Case diameter: 36mm (without bar) Case length: 43mm (total length from top to bottom) Case thickness: 13mm (including table mirror and bottom cover) Case ear position: 18mm (the link between case and strap) Watch mirror material:Acrylic Crystal Watch mirror type: Bubble mirror  Watch mirror coating: anti-glare blue coating Bar head type: screw-in screw lock bar Waterproof level: 100 meters waterproof / diving [can wash hands, swim, dive, to meet all daily waterproof use]