[Security Guaranty] Instead of using traditional D rings to hang the mirror, 2 mounting holes (1 of the 2 holes is for backup) on the back of mirrors are our security design to give the mirror more support and make sure they are safe enough to be mounted. Plus, all the mounting hardware is included, so you do All of our mirrors are made of 4mm high-quality shatter-proof glasses, which means they have very clear reflectivity, no warp. Additionally, they are very solid, not easy to get broken. More importantly, the glass won't spill out even when it is accidentally broken. We also use a durable waterproof MDF backboard to make the mirror super sturdy and durable.