From back cover text:
Game of Professional Basketball
Inside this box you'll find everything you need to recreate an entire professional season. Every player from every pro team is here, each one ready to play for you just the same way he did in the regular season. The only difference between PRO BASKETBALL and the real thing is that now YOU are the coach!
Box has Sports Illustrated branding, but this is definitely one of the Statis-Pro line - has Fast Action cards with "Statis-Pro Fast Action card" label and player cards with "Statis Pro Basketball 1984-85" label.