This is a strap. There are many like it, and this is another one. US surplus made by Specialty Defense Systems. Available in various colors.
The strap is 1.0" / 25 mm wide. This is a long one, it measures 66" / 170 cm when opened. As it is 1.0" wide, it fits through MOLLE/PALS webbing. This strap has a side release buckle on it, which you can open even when the strap is under tension. The strap length is adjustable. If you are going to feed this strap through some MOLLE/PALS webbing, first remove the male buckle, so your swear jar won’t fill up immediately.
This item is unused US surplus, manufactured by Specialty Defense Systems.
Mick G.