The roller conveyor series has a simple structure, high reliability, and easy maintenance. Typical roller materials include plastics (PL), carbon steel galvanized (CS), stainless steel (SS), rubberized (RU), and chrome plated (CP). They convey items of different weights ranging from light to heavy and can withstand large shock loads. The series consists of non-powered and powered roller conveyor systems. The accumulation function can be realized, and the accumulation force can be adjusted in the powered roller conveying series.