Material:ABS, acrylic optical lens, metal accessories Lens Magnification:1.5X, 2X, 2.5X, 3.5X Lens Focal Length:20 inch, 10 inch, 8 inch, 4 inch Product Size:24.8x20x5cm 9.76x7.87x2 inches Package Size: 29.5x20.8x5cm 11.6x8x2 inches Product Weight:138g Package Weight:357g Features: 1.dual lens design 2.with 4-level magnifications 3.4 interchangeable glass lens plates 4.head-mounted design 5.adjustable head leather pad 6.adjustable headband 7.hands-free Package Contents: 1x Headband Magnifier 4 Glass Lens Plates - 1.5X, 2.0X, 2.5X, and 3.5XSize - 24.8x20x5cm 9.76x7.87x2 inches head-mounted and dual lens design, 4 magnification lens plates can be interchangeable, to meet your different magnifying needs. The head leather pad and adjustable headband for more comfortable and tight head wearing, ideal hands-free magnification tool for improved efficiency while performing detailed tasks. Perfect for electricians, sewing, crafts, painting, reading, knitting, soldering, model building, coins, stamps, jewelry identification, watch and electronic repair, machining, miniature engraving, print inspection etc. Material- ABS, acrylic optical lens, metal accessories durable and impact resistant, lightweight shell frame. The Headband Magnifying Glass with 4-level magnifications:1.5X, 2X, 2.5X, 3.5X Lens Focal Length:20 inch, 10 inch, 8 inch, 4 inch.