Fotasy HERO37 Pro 37mm Metal Filter Adapter and Lens Cleaning Cloth for Gopro Hero 4, 3+, 3 (Black) Fits all Gopro Hero 4, 3 and 3+ Model Made of 100% CNC machined aluminum Allows you to use other any 37mm ND, Polarized, Colored, Close up filter and lens Aluminum material(lightweight), Black anodize(Durable), CNC cutting(Precision) Fotasy Premier Lens Cleaning Cloth