Liquid Glass 50 Screen Protector from cellhelmet is an invisible, nano liquid. You apply it onto your phone or watch's glass screen. It fills in any pores or imperfections, then dries and cures to strengthen it on a molecular level! LiquidGlass 50 also includes a $50 screen repair guarantee, should it fail to protect your glass. This is a .02 oz./.6 mL vial.