NiSi 43mm True Color ND-VARIO Pro Nano 1-5stops Variable ND | NiSi Optics USA
Amazon.com : K&F Concept 43mm Variable ND Filter ND2-ND32 Camera Lens Filter (1-5 Stops) No X Cross HD Neutral Density Filter with 28 Multi-Layer Coatings Waterproof (Nano-X Series) : Electronics
Neewer 43mm Variable Nd Filter Nd2-nd32 Camera Lens Filter (1-5 Stops) No X Cross Neutral Density Ultra-slim Filter - Camera Filters - AliExpress
Amazon.com : JJC 43mm ND Filter ND2-2000 VND Variable Neutral Density Adjustable Fader for Canon EF-M 22mm f2,RF 16mm f2.8, for Fuji Fujifilm XF 35mm f2,XF30mm f2.8,XF 23mm f2 & More Lenses