Are you looking to buy GoPro Hero Dual ND Filter Holder in Australia?
Price includes ONE piece unless otherwise stated in the product title. Frame / other parts in the picture are obviously not included and intended just to show you the printed part in context. Suits Hero 5/6/7
These were designed as a collab with Wild Willy FPV
They fit TWO ND filters, giving you much more control over the amount of light entering your GoPro. Ultimately this allows you to make changes to the frame rate that will give you much smoother footage. Buttery smooth :) Here's a great video that explains how it works and how to get the most out of them. Start from 2:20 if you want to cut to the chase: