Printer Data Cables with *suspected* IC boards
Those black lumps are noise supression beads especially if they are heavy and stick to magnets.

eg: https://nz.mouser.com/ProductDetail/Fair-Rite/2643540202?qs=sGAEpiMZZMsuct6UGZJC7V3VDI5SybAbaF8BfY3CDFQ%3d