Uxcell Watch Glass Sapphire Crystal Lens Single Dome Round 42mm Dia. 1.3mm Thickness Clear 1. Made of sapphire crystal glass not easy to break strong and durable. Good transparency smooth surface high temperature resistance scratch resistance wear resistance. It is clearer and more beautiful than flat glass 2. The watch glass lens is very transparent with rounded and smooth edges comfortable hand feel no scratches. 3. Easy to install and replace the broken one can be easily replaced. It s very suitable for watch repairman to repair their watch by themselves. 4. The sapphire crystal glass is easy to clean and only needs to be wiped clean with a soft cloth after long-term use. Please be careful not to wipe with paper or cloth that is too hard so as not to scratch the surface of the glass and affect the appearance of the watch.