REPLACEMENT AIR FILTER FOR THE CARBONSMITH CARBON FIBER AIRBOX MADE WITH UNI FOAM FILTER - FOR CLEANING AND OILING INSTRUCTIONS: https://unifilter.com/cleaning-oiling/ 5 DIFFERENT FOAM DENSITY OPTIONS - EXTRA COARSE = LESS FILTRATION & MORE AIR, EXTRA FINE = MORE FILTRATION & LESS AIR In order to maintain our extremely high standard of quality products, CarbonSmith AIR FILTERS are not available in mass quantities and are made to order. �Each AIR FILTER takes 12 HRS TO PRINT and are MADE TO ORDER , therefore your patience is very much appreciated. PLEASE READ OUR TERMS & CONDITIONS BEFORE PURCHASING, THANK YOU!