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 3.5XPerfect for electricians, sewing, crafts, painting, reading, knitting, soldering, model building, coins, stamps, jewelry identification, watch and electronic repair, machining, miniature engraving, print inspection etc. Size - 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. 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.