GREAT VALUE: These are replacement carbon air purifier pre-filters that help effectively filter airborne particles such as smoke, dust, pet dander and fabric fibers. COMPATIBILITY: Compatible with the RabbitAir BioGS 2.0 air purifier models SPA-550A and SPA-625A. Please note that this is a replacement product, not an OEM product. MOST EFFECTIVE: Not only do carbon pre-filters prolong the life of HEPA filters, they capture the largest particles that bother your airways such as hair, lint and dust. Carbon-activated filters perform as an odor remover. They specialize at cleansing your air of cooking odors, smoke, and gaseous particles. USED BY PROFESSIONALS: LifeSupplyUSA Air Purifiers Filters are made to be durable & efficient for months. Ensure the maximum airflow supply volume & protect your device. SIMPLE TO INSTALL: Installation is easy; no tools required. Simply remove and replace from your air purifier unit when needed.