Pack of 5 pieces of 2mm spaced, 40-pin male headers with right-angle connection. When installed on your PCB, these headers will lay horizontally, i.e. parallel to the board.
This is not the common standard 0.1" pitch (that would be 2.54mm). These headers are for PCBs with the tighter 2mm pin spacing (0.079").
These are breakaway strips, which means you can break them apart easily to make any smaller length you need.