The 4 pack of Xtreme Dive Filters consists of two red filters, magenta, and a yellow filter. The filters allows scuba divers to capture the best footage without having to worry of colour not being right underwater. The red filter compensates for the lack of red spectrum light and helps deliver accurate, vibrant colour in your video; and the Magenta helps for the lack of red light but are optimised for green water between 4-21m, which helps retains the contrast needed for important video footage; and the Yellow Filter is advisable in shallow tropical waters in the morning in order to retain colour back into the scene.