Hi, No problem drifting in here at all. We're all friends... mostly. LoL. I haven't measured it exactly yet but I hear that is about 6 1/2 ml. I'll measure it another day to be exact and post it here. I have a Doberman Pinscher and she loves all kinds of antlers. I get them from my hunter friends. Great chew toy! If she gets tired with them I usually put them in boiling chicken or beef broth. Makes them taste and smell better.