BRAND NEW POLYCARBONATE ND FILTER SLIP ON FOR HERO3 NAKED CAMERA. FOR USE OUTSIDE THE WATERPROOF CASE FOR EX: FPV APPLICATIONS. SUPER LIGHTWEIGHT & PUSHES ON FOR A TIGHT HOLD. ONLY USE ON SUNNY DAYS TO MAKE THE COLORS MORE RICH & PREVENT GLARE FROM THE SUN OR ON WATER. IF IT GETS DIRTY, SIMPLY CLEANS UP WITH WINDEX JUSTLIKE YOUR STOCK LENS. IF ITS EVERY TOTALLY SCRATCHED ALL UP CAN ALSO BE USED AS A TRANSPORT LEND CAP PROTECTOR BOOT.