We have 16 concrete blocks, free to anyone who wants them. Some of the smaller ones have a bit of mortar clinging, but not much. Take one, two...all, whatever you need. Here are the dimensions:    --five of them are 7 1/2" w X 11 1/2" h X 15 1/2" l    --eight of them are 7 5/8" w X 7 5/8 " h X 16" l    --two of them are 7 1/2" w X 7 1/2" h X 15 1/2" l    --one is 7 1/2" w X 11 1/2" h X 16" l We're in Highland Park on Stanton Avenue. If by chance you want a photo of the blocks, I'll be happy to send it.