Using this ND filter holder is easy. First, make sure your GoPro is Hero 5, 6, or 7. Then, place an ND4, ND8, ND16, or ND32 filter into the holder. Attach the holder to your GoPro. You can now adjust the frame rate of your camera to get smooth footage. Remember, the price usually includes only one holder, so check the title carefully. Also, the frame and other parts in the picture are not included. To maintain your holder, keep it in a dry place. Since it's made of TPU, avoid exposing it to sharp objects to prevent scratches.