They are made of pewter.
I received them a few years ago, I gave some away until I recently got one back in a letter :-)
"Each set contains ten tokens with five different promises: there's the Kiss token (good for one kiss), the Massage token (good for one massage), the Good Morning token (good for one breakfast in bed), the Love token (good for one roll in the hay) and finally the Hug token (yep, you guessed it, good for one hug). As well as a cutesy vow, each meaningful token features a cut-out middle section depicting a heart, hand or coffee cup. Handy if your ideal partner doesn't speak the lingo." -from firebox.com