Rubber, nitrile rubber, silicone rubber, polyurethane. Cots commonly offset surface layer generally used nitrile rubber, polyurethane selection of high-grade plastic. Cots are also one of the main components offset inking system, to continue contact with water, ink, paper, etc. and should therefore be minimally adsorbed moisture. Compared with the metal roller, rubber roller has elasticity, acid, no rust, etc., with good ink absorption and transfer ink, easy to clean, which is widely used. Cots have on different types of presses different role, how to choose the quality and performance of the printing rollers, printing plant to improve production efficiency, meet customer production requirements, quality assurance in print, has a very important significance. With high-speed multi-color offset printing as well as "green" voice rising, alcohol wetting will also be controlled, the printing quality is also rising, high-end, the number of high-speed printing presses have continued to increase, supporting the needs of the market and the press printing rollers increasingly high quality. We can say the high-end printing rollers with high-end printing machine, in order to have good print production.