Note: The screen protector is intentionally cut smaller than the display because the edges are curved. Scratch-resistant, hard-coated surface! 3H pencil hardness. Test winner in c't magazine issue No. 3 (2012): Anti-reflective films tested. Among many well-known manufacturers, the dipos anti-reflective film is the only one rated very good for reflection reduction. Intentionally smaller than the Samsung Galaxy M31 glass, as it is curved (see photos), it is bubble-free and can be removed at any time without leaving residue (no adhesive). Easy application - 100% bubble-free installation on a cleaned display! The special silicone adhesive layer displaces air during application and naturally conforms to the display. No impairment of usability! The dipos screen protector offers a pleasant touch experience and is optimized for the Samsung Galaxy M31.