The Neutral Density replacement packs of 5 or 10 filters allow the active GoPro Hero3 user to use and abuse their favourite filters without the need to repurchase a full kit. This kit includes replacement Neutral Density Filters in 0.6, 0.9 or 1.2. These filters combat the rolling shutter effect caused by shaking or movement of the camera and the extremely short shutter speed of the GoPro Hero3 camera. These filters will only work with the Formatt-Hitech GoPro Hero3 holder.