Magnetic Privacy Filters for MacBook keep your screen safe from prying eyes. By reducing the field of view by approximately 60 degrees, the filter hides the readability of your screen for people nearby. It installs and removes easily as many times as you want. Reduces readability by approximately 60 degrees. Magnetically attaches to the frame of your MacBook. Reduces eyestrain and blue light. 1 face in matte finish that reduces glare and traces. 1 face in glossy finish which improves the readability of the screen. Protects against scratches.