The SEBO 6696AM K Series Filter Set works with the SEBO Airbelt K Series Canister Vacuums. The SEBO Filter Set K includes a replacement S-Class pre-motor micro filter that attracts and captures dust particles before air reaches the motor of the vacuum. This increases the motor lifespan. The S-Class filter absorbs greater than 99.9% of particles down to .3 microns. Its open texture allows for greater airflow for better suction. The exhaust filter cleans the air from the motor.