Based on this product's specifications, here are some alternatives and similar models
Neutral density camera filter B+W 802 Master, 43 mm, Multi Resistant Coating (MRC)
Summary description:
B+W 802 Master neutral density camera filter, 43 mm thread, with Multi Resistant Coating (MRC). Single-piece optical filter that reduces light intake for exposure control and motion blur management without changing color balance. Suited for landscape, long-exposure, and video work where precise light reduction is needed. Sold as 1 piece.