Based on this product's specifications, here are some alternatives and similar models
Neutral density camera filter B+W 803 MASTER, 39 mm, Multi Resistant Coating (MRC)
Summary description:
B+W 803 MASTER neutral density (ND) camera filter, 39 mm thread, designed to reduce light entering the lens for longer exposures and wider apertures. Single-piece pack with Multi Resistant Coating (MRC) for improved scratch and reflection resistance. Suitable for landscape, long-exposure, and motion-blur photography on compact and mirrorless setups with 39 mm lenses.