1.5mm Double Dome Blue AR Coating Sapphire Watch Crystal 30mm to 38.5mm Replacement Watch Glass Lens Repair Parts Tool Brand new replacement watch glass crystals (this is NOT screen protective guard). High hardness sapphire material, Moh's hardness :grade 9. Double Dome watch crystal, Increase the sense of the depth. With Blue light AR coating film on the underside. Glass thickness: about 1.5mm. Package included: 1x watch glass. available diameter size: 30,30.5,31,31.5,32,32.5,33,33.5,34,34.5,35,35.5,36,36.5,37,37.5,38,38.5mm ~~~~~~~~~~~~~~~~~~~~~~~~~~~