This is the Backscatter FLEX DIVE Filter for GoPro Hero3+ and Hero4 Standard Housing Features: Simple press on color correction filter system DIVE filter is included and is optimized for blue water, 20 to 50 feet deep The FLEX FILTER system is a simple press on color correction filter system for the Hero3+ and Hero4 standard housings. The FLEX system allows any filter from the FLIP4 system to mount to the FLEX FILTER frame, giving you the flexibility to expand your filter system in the future. The DIVE filter is included and is optimized for blue water, 20 to 50 feet deep. The FLEX frame is made of a flexible material that will not shatter or break, ensuring your FLEX filter system will stand up to rough conditions.