The lee bug action filter kit is designed to give your gopro movies a professional look with detailed skies and saturated colour this action filter kit is for use with the gopro hero 3 action camera and includes 1x lee bug filter holder 1x 09 hard nd neutral density graduated 3 stop square filter 1x polariser filter a protective pouch and a cleaning cloth the nd grad offers a hard transition from dark to light and helps to prevent the sky from burning out and losing detail the polarise