Element Protective Lens Cover for Eotech 551 552 553 Dot Sight
[AS911]

pretty good, nice and thick, but still see through. was hard to get on but at least i know its not gonna come off anytime soon, and definitely will protect the sight. only 4 stars because it does make it a little harder see then it normally would without it. but definitely worth a loss of visibility to be able to protect a 50 dollar investment that you dont have to pay for again