Specialized, low-profile 0.1" spaced round-pin, machined, 10-pin breakaway header that can be easily cut into whatever length is required. This header is usually attached to the target board, making a very low-profile connection point for tight/complex installations.
This set is pre-cut to length for LEDunio! display mounting, or it's just a bit of a better deal if you just need a bunch of machine-pin sockets!
A common LED module has two rows of 9 pins, or our custom 4-digit module has two rows of 9+9 pins (same spacing as 2 x LEDs though...)