I had some left over from helping a friend build a boat. I think that it is the same density that they use in taxidermy forms, but not sure. It was 12 or so years ago. I have been thinking about researching different foams and making a few but square. I had a couple that were a little bigger than footballs for kicking then random shooting but they are all beaten up. I got the idea from a guy at the old archery shop that was on Jackson Highway in Chehalis years ago.