Based on this product's specifications, here are some alternatives and similar models
Neutral Density Camera Filter Kenko RealPro MC ND1000 55mm
Summary description:
Kenko RealPro MC ND1000 is a 55mm neutral density (ND) camera filter that reduces light entering the lens by approximately 10 stops for long exposure and aperture control. Multi-coated (MC) glass minimizes reflections and flare. Suited for landscape, architecture, and motion-blur photography where extended exposure times or wider apertures are required.