Features: Pinhole glasses, which are like sunglasses but with a grid of tiny holes, exercise the focusing muscles of your eyes and also help reduce heart-rate, headaches and tension How Pinhole Glasses Work: When you look at a blurred object your brain moves the focus of the eye in and out until it gets an increase in contrast. If no increase is achieved your brain leaves the object unfocused. Pinholes spectacles improve the sharpness of the image, allowing your brain to find the point of focus. During this process the focusing muscles of the eye are used more and this regular exercise helps your eyes' focusing system. Specifications: Color: Black+Silver Material: Resin+Metal Size: See pictures Quantity: 1PC Note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 0-3cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: (Without retail package) 1PC x Pinhole Glasses