I put together a couple of tubes last weekend. I have a picture of them in my gallery with a lapdist.com 10" x 2" one in the middle of picture for comparison. They are not nearly to the standard of the lapdist.com product but cost a lot less. The smallest one is 8.3" long internal and oval in cross section. I have pictures in my gallery of the tubes and a picture of the smallest one being tried for size in case anyone is interested.