Features: This filter is designed for diving fans who like taking photos and videos under water Due to wave refraction, pictures taken underwater may suffer color distortion. Using this color correction filter, pictures taken under water will be more lively and natural Directly use on the waterproof lens cover ,very convenient Improve underwater colors Compatible With: For Hero 4 3+ Color: Purple, Red, Yellow, Grey Material: ABS Size: Approx. 5.3x4.8x1.2cm/2.09x1.89x0.47'' Package Included: 4 x Underwater Diving Filter Lens