Based on this product's specifications, here are some alternatives and similar models
Neutral Density (ND1000) Full-Frame Filter for DJI Mini 4 Pro — K&F Concept Nano-X (model SB8567)
Summary description:
K&F Concept Nano‑X ND1000 neutral density full-frame filter (model SB8567) designed for DJI Mini 4 Pro drone. Provides 10‑stop light reduction for long‑exposure and motion‑blur effects, helping control exposure in bright conditions and enabling smooth cinematic footage. Compatible with Mini 4 Pro lens mounting, useful for landscape, aerial photography, and videography workflows.