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Donegan Optical LX347 OptiVISOR AL Headband magnification set consists of lightweight lenses and is made of tough materials for better durability. It consists of adjustable side pivots to tilt at your fingertips. The dial adjustment headband comfortably fit to all head sizes. Set comes with genuine leather padded comfort band with orthopedic felt to provide extra comfort. Set contains optical visor with one 3 diopter that magnifies 1.75 X at 14 inches, one 4 diopter that magnifies 2 X at 10 inches, one 5 diopter that magnifies 2.5 X at 8 inches and one 7 diopter that magnifies 2.75 X at 6 inches.