Size: Lens diameter: 10 times 15 times diameter is 20mm single layer lens20 times 25 times is 16mm double lens Objective magnification: 10X, 15X, 20X, 25X Color: Black Material: ABS + Optical Lens Weight: 156g Package includes: 1 x LED magnifying glasses, 1 x headband, 4 x pairs of lenses Safety Material: Made of high quality material that is safe, odorless, non-toxic, ecological and durable. 4PCS Lens: Comes with 4pcs different magnifying glass that has great magnifying power with added sharpness and clarity so you can get extremely close view of even the smallest details. Easy to Carry: Portable design makes it compact and lightweight, lightweight carrying case and headband is interchangeable. Wide Application: Ideal for repairing and inspecting jewelry, stamps, coins, notes, etc.