Description: Easy snap-on design, convenient to install and remove. Effectively help to correct color deviation and restore color. Red: Used in tropical water in depth of 30-65feet / 10-20 metres, at noon ( when the for sun is high in the for sky). Purple: Used in green water, for fresh water such as lakes and streams or dusk hours. Pink: great for removing unwanted reflections from non-metallic surfaces, such as glass or water. Mounted on a rotating frame, this filter can be adjusted to block different levels of reflection. Nice accessories to bring you better shooting experience for underwater filming. Specification: Lens material: Tempered glass Color: as the picture shows Applicable Model: for Go pro 9 Action Camera Note: If you have big quantity (only need over 50 dollars), please feel free to contact me, I will give you SURPRISED PRICE(The more the quantity, the lower the price), thanks Size For Manual Measurement, there may be a 0 to 2 for cm error, belongs to the normal phenomenon. And due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Includes: 1set x Filter (No retail package)