Caffeine, the world's favorite drug. This is a high quality key chain that has been cast in alloy metal and is hung on a standard size steel key ring. We know you are busy, so we have packaged it in a classy kraft box tied with string and a blank card. All you have to do is sign the card and present this thoughtful gift. It is a great gift for the intellectual in your life. The molecule measures 2 and a half inches and is light weight. It can be given as a gift of love or as an interesting professional gift.