Home recordings (also known as personal recordings) are blank or shaved commercial cylinders that have been recorded by normal people. Some appear at the beginnings and ends of cylinders too, and sometimes over the un-shaved cylinder. These are most commonly brown wax and black wax. Edison sold blank wax cylinders and Both Edison and Columbia sold recording heads. Most surviving home recordings are 2 minute, because they were already out of date by the time the 4 minute recorder (wich is exceedingly rare now) were produced. Many home recordings are moldy and worn.