1. Material: activated carbon sandwiched carbon non-woven fabric 2. Take care of the engine and maintain strong power 3. Replacement: more than 30000 or 3 months is recommended 4. Function: purify the air, keep the engine clean 5. Applicable models: WY125-F, WH125-B, Fengyi 125, MCR125 6. Size: inner diameter 7.9cm, outer diameter 11.3cm, height 7.2cm