The term 'cartridge holder' can refer to a variety of objects. A tonearm, which is seven letters long, is a mechanical device used to move a stylus across a record. A PEN, which is three letters long, is a writing instrument used to make marks on paper. A RIFLE, which is five letters long, is a firearm designed to be fired from the shoulder. A CHAMBER, which is seven letters long, is a space in a gun or other device where ammunition is loaded. Finally, a MAGAZINE, which is eight letters long, is a container for holding ammunition or other items. All of these items can be used as cartridge holders.