Method Seven "Classic HPS Clip-Ons" change the way you see your plants and grow room using your own prescription glasses! The Classic style clip-ons have high quality lenses with spring-loaded rubber coated metal clips that gently hold to your eyewear. This Classic style fits a wide variety of smaller or less shaped lenses. For larger lenses look at "The Aviator" Clip-on. Manufactured in Italy to our exacting standards by Carl Zeiss Vision. For use under HPS lighting.