These Slim Sport Loupes from Seiler provide impressive magnification at a reasonable price. They can be used to enhance any practice that requires low power magnification. The amount of clarity they offer is unparalleled. The user gets to choose the working distance, color, and magnification level. The three magnification levels are 3.5x, 3.0x, and 2.5x. The color choices include silver, black, and blue. For the working distances, 340mm, 500mm, and 420mm are available.