ToolUSA 4 Piece Black Plastic Jeweler's Eye Loupes With 2.5x, 5x, 7.5x, And 10x Power: MG-18411 Set contains 4 pieces with powers of 2.5x, 5x, 7.5x and 10x with high quality glass optics Loupes have plastic frame colored in black - lightweight and durable Measurements for the diameters are 1-inch (10x), 1.5-inch (7.5x), 2-inch (5x), and 4-inch (2.5x) A variety of magnifications allows flexibility and applications for many uses Great tool that can be used for prints, stamps, molds, watches, fine arts and jewelery