Called polyurethane round belt, which can be accessed round belt, PU material usually, PU is the abbreviation of Polyurethane, the Chinese called polyurethane called polyurethane. Round belt is generally divided into smooth and rough circle with a round belt: round band of light orange, round face with thick dark green. Specifications can be produced from ∮2 ~ ∮18; light with good surface finish, bright color, thick with surface roughness, particle uniformity and tidy, comfortable, wide range.