Rollers, POTENT is a leading manufacturer of belt conveyor in China. RollersPOTENT is a leading manufacturer of belt conveyor in China. A. Double Lines Ceramic for Drive pulley.B. Single Lines Ceramic for Drive pulley.C. Flat Ceramic for Non Drive Pulley.D. Herringbone/Chevron Groove.E. Diamond Groove for Drive Pulley.(PL Type, PG Type, PH Type, PT Type, PHK Type, PTK Type) Conveyor Rollers 02