The VisorMag from Carson is a set of clip-on, flip-up magnifying glasses that attach to the brim of most caps and hats. Perfect for fly-tying and all fly-fishing needs. Complete with protective soft-pouch, its crystal clear acrylic lenses give you a sharp, distortion-free view that allows you to see even the finest details with ease. Keep these clip-on Magnifying lenses in your tackle box so you will always have them ready. The VisorMag magnifying lenses are available in 3 different magnifications. The VM-10 model has a 1.75x magnification which is equivalent ot +3.00 diopters. The VM-12 version has a 2x power magnification which is equivalent to +4.00 diopters. The VM-14 version is the most powerful version at 2.25x magnification which equates to +5.00 diopters. The VisorMags are backed by Carson's Limited Lifetime Warranty. At Carson, we strive to make sure our customers are 100% satisfied with the quality of our magnifiers We are so confident in our riflescopes that we back them with a Lifetime Limited Warranty! Carson will repair or replace your magnifier if it is found to have manufacturing defects in materials or workmanship. Please contact Carson for additional warranty details.