Specification AgeRangeDescription : Kid Brand : CYZW BulletPoint : Weight:43.6g Size:39*27*5.5MM BulletPoint1 : Name: Plat Synthesis Sapphire Crystal glass ;Mirror color: blue light BulletPoint2 : Warm tip: under different background colors of dial face, blue light presents slightly different shades. Blue light installed on dark dial face is obvious, while blue light on light dial face is slightly lighter. BulletPoint3 : Electrodeposited surface mirror can be divided into double-layer and single-layer coating, that is, a layer of film is plated on the surface mirror to make the mirror reflect into a specific color BulletPoint4 : As the coating will reduce the original wear-resistant characteristics of sapphire, the mirrors of this product in our shop are all single-layer coating, that is, the bottom is coated with blue light, the front is not coated, and the front is as wear-resistant and scratch resistant as the original sapphire. BulletPoint5 : In this way, it is beautiful and retains the original wear-resistant advantages of sapphire. Color : Clear CompatibleDevices : Watch CompatiblePhoneModels : For watch part ExternallyAssignedProductIdentifier : 9586907464271 ExternallyAssignedProductIdentifier1 : 0791519691048 ExternallyAssignedProductIdentifier2 : 791519691048 ItemName : CYZW 1.2mm Thick Single Side Blue AR Coated Flat Sapphire Watch Crystal Glass 26-40mm (39mm) ItemPackageDimensions_Height : 5 centimeters ItemPackageDimensions_Length : 10 centimeters ItemPackageDimensions_Width : 10 centimeters ItemPackageQuantity : 1 ItemShape : Round ItemTypeKeyword : science-classroom-optics-kits Manufacturer : CYZW Material : Glass ModelName : Artsim ModelNumber : Artsim NumberOfItems : 1 PartNumber : Sou5-AL44-OT1-828 ProductDescription : Notice: 1. There maybe ±0.05mm error for diameter and 0.1mm for thickness. Please measure your crystal size via a vernier caliper with a screen before you make a purchase. Description: Material: synthetic sapphire glass Single side blue AR coated. The AR coated side should be the bottom side. Please check which side is coated before installation. Thickness: 1.2mm Diameter available: 26/26.5/27/27.5/28/28.5/29/29.5/30/30.5/31/31.5/32/32.5/33 33.5/34/34.5/35/35.5/36/36.5/36.5/37/37.5/38/38.5/39/39.5/40mm Pack include:1pcs ProductSiteLaunchDate : 2020-04-14T07:00:00.000Z ScreenSurfaceDescription : Glossy Size : 39mm SupplierDeclaredDgHzRegulation : other Theme : Physics UnitCount : 1 UnspscCode : 43191600 WarrantyDescription : A