A cello bow is a specialized tool used to play the cello, a string instrument. It consists of a long, slender stick made from materials like wood or carbon fiber, with horsehair stretched between its ends. The horsehair is coated with rosin to create friction against the cello strings, allowing the musician to produce sound. The design of a cello bow includes a frog, which is the part held by the player, and a tip, which contacts the strings. Bows come in various weights and styles, affecting the sound and playability. Musicians choose bows based on personal preference and the desired tone.