... 14M,T5,T10,MXL, XL, S3M,S5M... Steel Timing Belt PulleyPulley type:MXL,XL,L,H, ... your design.Material for option:aluminium alloy,steel,stainless steel,iron,plastic,nylon,etcMax width of the ... pulley :520mm.Surface treatment:High frequency,black of oxidation,zincing,nickelage,anode.Machine:CNC ... (Black of oxidation):Nylon Pulley: Steel Timing Belt Pulley