There are many low cost glass screen protectors to choose from. Mostly hit or miss with production quality and advertised description to make a good choice. I've tried a few different makers. As far as glass protectors for my Moto g6, the amFilm brand fits the best. Accurate fit and excellent adhesion. No dirt, lint or debris has leaked in between screen and protector. There are no bubbles inherently by design and material. The precision cut-outs for the sensors line up exactly, unlike other brands I've tried.All the glass protectors seem to have a "rainbow" effect in the middle of the screen. Mainly because the design is such that the adhesive is only along the black mask edges which leaves the clear section with a void "air pocket". While this design for glass will have absolutely no bubbles whatsoever....however that air pocket causes reflection between the two glass surfaces, hence the rainbow effect. There's no way around it. Its the nature of the design since the protector has no adhesive on the clear section. It will never disappear despite other reviews. The air pocket may move around or appear smaller at times based on prevailing conditions. The irony is sacrificing abnormality vs ease of installation and no bubbles. The rainbow effect does not bother me. My requirements are precise cut-outs for the sensors, easy installation, excellent fit and strong adhesion along the masked edges. The amFilm possesses these qualities for me. YMMV.