Based on this product's specifications, here are some alternatives and similar models
Neutral Density Variable Filter K&F CONCEPT 67 mm (ND2–ND2000) Gray, Adjustable, Nano-C Coating
Summary description:
Adjustable neutral density (ND) filter K&F CONCEPT for 67 mm lens threads, offering variable density from ND2 to ND2000. Gray Nano-C coated glass reduces light uniformly for long exposures, motion blur control and aperture flexibility in bright conditions. Fits cameras and lenses with 67 mm filter thread for landscape, architecture, and creative photography.