Are there any instructions for the product?
You can download the digital guide from this page under "Product guides and documents.
What is the material of the filter?
The filter is crafted with German optics, while its ND frame is polycarbonate (PC). The frames for ND/PL, CPL, and GND are made of PC and rotating rings of CNC aluminum.
What is the filter weight?
ND 0.7 grams and ND/PL 1.1 grams filters can help keep your drones weight under 250 grams.