Rollers are cylindrical tools used in various applications, primarily for painting and applying coatings. They consist of a handle and a rotating cylinder covered with a fabric or foam material. When dipped in paint, the roller can efficiently spread the paint over large surfaces, making it a popular choice for both professional painters and DIY enthusiasts. In addition to painting, rollers are also used in fitness, such as foam rollers, which help relieve muscle tension and improve flexibility. These foam rollers are often used in physical therapy and exercise routines to aid in recovery and enhance overall performance.