12-15T Pulley set as a replacement parts for CDJ Big Pulley kit V3 models.
 
CDJ original pulley ; AURUM+CF30, a kind of special plastic contains 30% carbon fiber. It’s light but very strong like a metal. Almost half of aluminum weight. High noise reduction and low sliding friction. Color is like a dark green with marble.
 
Hybrid ceramic bearings (ceramic balls with steel housing combination) installed as standard.   Full ceramic bearings are selectable.