PUR exclusive enhanced HVAC filters up to 99.7% of dust, pollen and contaminants, PUR exclusive activated carbon weaves are USA-engineered to last up to 15,000 miles, 25% longer than standard performance of 12,000 miles, PUR filter use thick, industrial strength electrostatic media to trap even the tiniest of particles while densely packed activated carbon prevents gases and odours from entering the cabin, Road debris, exhaust fumes, and contaminants undergo filtration through a three-layer system, which includes a dust filter for trapping road debris, a particle-averting filter to block airborne particles, and an adsorption filter for absorbing exhaus, Contains soda combined with carbon cleans the outside air flowing through the ventilation system, Part Reference Numbers : 97044 XC11710 CF12312 CF12552 CF1401 TC21496 C21496C WP10447, Kit Includes: 4x Cabin Air Filter, Kit Variations: K54-100530 K54-100840 K54-100999 K54-101158 K54-101317 K54-101476 K54-101635 K54-101642 K54-101680 K54-101718, Part Reference Numbers : 97044 XC11710 CF12312 CF12552 CF1401 CF1405 TC21496 C21496C WP10447