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 bow is drawn across the strings of the cello to produce sound, allowing musicians to create a range of tones and dynamics. The design of the cello bow includes a frog, which is the part that the player holds, and a tip, which contacts the strings. The tension of the horsehair can be adjusted using a screw mechanism, enabling players to achieve different sound qualities and techniques.