For a "solid" account of the Cobra collection and its history, you can refer to the following sources:
Cobra Killer by Andrew E. Stoner and Peter A. Conway provides a comprehensive true-crime investigation into the studio, the murder of Bryan Kocis, and the rivalry with competing producers Harlow Cuadra and Joseph Kerekes. Cobra Twink Collection
The studio helped popularize a specific "boy-next-door" aesthetic within the gay adult industry during the transition from physical media to the early internet era. For a "solid" account of the Cobra collection