This is a single spool of 600 yards of 80 Lb. black braided dacron trolling line.  Product specs:

Professional Quality tournament grade braided dacron line, the favorite of fresh salt water anglers for years. A firm braid of dacron fibers offers maximum sensitivity. G-6 is the ideal line for today's responsive graphite and S-glass rods. Tournament fishermen the world over appreciate G-6's instant strike response.