I put as heavy paperbacks as the collection is 4lbs give or take and wanted to be sure it was postmarked right for delivery They are being sold as a lot There are some markings and small dogears but otherwise in good condition. Two are visibly ex library books. I've never used them and know little about them other than they are used with or without the actual full text. They came to me through a lot of books. $3 for all.