Sorry if not allowed, but These have decent reviews and for the next 5hrs they are $21 bux shipped. I was looking at the Skytreat and polar pro ones, but for for the price, what the heck?
HOBBYTIGER DJI Mavic Pro Accessories, Filter ND Set 4-Pack
https://smile.amazon.com/gp/product/B0711BYG8T/ref=od_aui_detailpages00?ie=UTF8&psc=1
HOBBYTIGER DJI Mavic Pro Accessories, Filter ND Set 4-Pack
https://smile.amazon.com/gp/product/B0711BYG8T/ref=od_aui_detailpages00?ie=UTF8&psc=1