Most commercial or mass-produced cylinders are plastic. Most instantaneous cylinders are wax. Compact digital discs are made of a thin layer of aluminum coated with plastic. Use also for acetate. Use also for aluminum.
Item is other than a disc or cylinder.
All cylinders and some early discs. Most modern discs. Compact digital discs. Special playback characteristics Use only if a special process applied during recording must also be applied during reproduction. If the item specifies one characteristic, enter the code for that characteristic.