The "SS-Ele" (Elements) series is known for high-production-value photographic or cinematic sets. The "031" specifically identifies the volume or model featured in that particular release. If you are missing the other parts, you can often find the full file by searching for the exact string "SS-Ele-031" on the archive or forum where you originally sourced it.
: Right-click the .001 file and select "Extract Here" or "Extract to [Folder Name]" . SS-Ele-031_v.7z.001
7-Zip will automatically recognize the sequence and join all parts back into the original high-definition video or image set. SS-Ele-031_v.7z.001