PUR exclusive enhanced HVAC filters up to 99.7% of dust, pollen and contaminants, PUR exclusive 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 : 507632 XC10336 XC10619C XC10671 CF11810 CF1329 AFC1633 PC99158 C59186 WP10106, Kit Includes: 4x Cabin Air Filter, Kit Variations: K54-100003 K54-100144 K54-100433 K54-100610 K54-100716 K54-100875 K54-101034 K54-101193 K54-101352 K54-101511, Part Reference Numbers : 507632 XC10336 XC10619C XC10671 CF11810 CF1329 AFC1633 PC99158 C59186 WP10106