Walker Pit Tuning Air Filter Element - 6.23 in Diameter - 3.25 in Tall - 5.06 in Flange - Blue 91502 1 rating means that the

1 rating means that the Nomex ® interior and paint are fire retardant as well as the Kevlar(R) chin strap

Better yet

Ultra light & super strong shell

600 in/ft Taper

Walker Pit Tuning Air Filter Element - 6.23 in Diameter - 3.25 in Tall - 5.06 in Flange - Blue 91502 1 rating means that theProduct Description: Air Filter Element Pit Tuning Round 6. 23 in Diameter 3. 25 in Tall 5. 06 in Flange Synthetic Blue Sold Individually Walker Engineering specializes in high performance air filters and accessories for Sprint and Midget cars, as well as other racing applications. Designed and produced in the USA, Walker air filters give racers an extra edge on the track. Walker Performance Filtration is a world leader in innovation and development