Note: The screen protector is intentionally cut smaller than the display because the edges are curved. Better than glass: it won't break or shatter (not real glass, not tempered glass). Plastic armor film with 9H hardness (300g) and anti-shock layer (shock-absorbing film). Intentionally smaller than the OPPO Watch 3 glass due to its curvature (see photos), bubble-free and can be removed without residue at any time (no adhesive). Crystal clear (almost invisible), approximately 0.2 mm thick, oleophobic anti-fingerprint coating. 10-year manufacturer warranty - brand product made in Germany.