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 : R507633 507633 XC10305 CF12000 CF1285 AFC1667 PC9977 C31499 C38185 WP10142, Kit Includes: 8x Cabin Air Filter, Kit Variations: K54-100134 K54-100275 K54-100404 K54-100525 K54-100670 K54-100809 K54-100968 K54-101127 K54-101286 K54-101604, Part Reference Numbers : R507633 507633 XC10305 CF12000 CF1285 AFC1667 PC9977 C31499 C38185 WP10142