For motorcycles up to 150cc
The required number depends on the displacement. Please check here. 

• Easy installation - simply applying to the air cleaner box.
• Static suppression effect - improves intake airflow by reducing static electricity charged on air cleaners while driving*.
• Maintenance free - 2 years of use without maintenance after installation.
• Patented in Japan

*The effects will vary depending on the air temperature and humidity conditions.