【FitStill's Go Pro Hero 13/12/11/10/9 black waterproof housing dedicated diving filter】This three-colour filter is only suitable for the waterproof housing of the brand FitStill (FitStill's Go Pro Hero 13/12/11/10/9 black waterproof case). 【Note:】Waterproof aluminium alloy shell is NOT available! 【Three-piece diving filter】The pink filter is suitable for snorkelling at depths of 0.6 to 4.5 metres for colour correction in blue or clear fresh water. The red filter is suitable for underwater freediving at depths of 4.5 to 26 meters, as well as for colour correction for blue or tropical waters. The purple filter is suitable for use in fresh water from 2 to 21 metres deep and is used to correct the colour of green objects. 【Direct snap mount】the filter can be easily attached to the camera body or removed from it. Equipped with safety belt: Equipped with three safety ropes that can be hung on the hanging ring of the filter, and the other end is fixed to prevent the filter element from being lost. 【Packing list】pink filter x1, red filter x1, purple filter x1, rope x3.