With a Graph Glass screen protector installed on your GPS or fish-finder you can rest assured that your investment is protected from impact damage. Graph Glass is made from the highest grade Japanese quality glass, offering you premier strength and transparency. From 9-H glass, these protectors are shatterproof, anti-fingerprint, extremely transparent, and touch friendly. The tempered glass screens are also much easier to clean than stock screen, so you don't have to worry about water spots, salt rings, or slime stains!