PolarPro Frame2.0 PFV Quadcopter Filter 3-Pack For GoPro Hero4, Hero3+, Hero3 Ultra-Light weight filters (6.7g) for filming with gimbals Filters protect Gopro lens while filming outside housing Compatible with GoPro Hero3/3+/4 (when outside housing) Includes Polarizer (Lightest), 2-Stop ND (Mid), 3-Stop ND (Darkest) Glass lenses for optimal image clarity and scratch resistance