Fotodiox Pro WonderPana Go Filter Adapter Kit - GoTough Filter Adapter for GoPro Hero3+ and Hero4 Slimline Housing w/ 72mm Step-Up Ring Simple installation of all-metal WonderPanaGo filter adapter onto GoPro waterproof case, your case remains water tight! All-metal adapter screws on for a solid mount, your case remains water tight Adapter does not interfere with normal function of the camera or the case; Step-Up ring allows standard filters to fit the WonderPana Go filter system Precision made from premium-grade aluminum with anodized Flat Matte Black Finishing 24-Month Manufacturer Warranty