I usually bring one of those bic crystal pens, the cap is really nice to clean my finger nails too. I have used the cap also for other stuff which somehow i don't remember what it was now. They apparently weigh 5.8g, but I only bring a half full one to save some ;)
Based on math I'd guess about 0.5g each, but I haven't weighed them. Of course they'd be lighter if cut to 55mm or so, to fit in a match case or Altoids tin (front to back direction). They're about 80mm long as is.