A small brass piece in the form of a number or a letter. By poking these into places you can display your favorite combinations, like 69 or 88 or 666. With the letters the possibilities are similarly endless; umm... ET?
Traditional two prong attachment, carefully poke them through the fabric and fold. These are just a bit over 1 cm tall. Remember, 6 is also 9, just flip it around.
Real deal Finnish army stuff. One-off lot! But we have loads of them!