The "4K" suffix in searches typically refers to the release of the title. While many titles in this category are standard high definition (1080p), certain premium releases under the S1 label (which produces the SSIS series) are offered in 4K resolution. This version provides:
Authentic high-quality releases from S1 (the studio) usually feature minimal watermarking compared to web-rips. ssis448 4k
Use the standard industry ID SSIS-448 to allow scrapers like The Movie Database (TMDB) to automatically pull metadata and posters. The "4K" suffix in searches typically refers to