Fused-dual-layer design air filters offer combined performance and protection. The fused layers of open-pore foam and fine inner foam trap even the smallest particles. AIRFILTER PRE OILED TM Racing 250 MX-Fi 22-23 450 MX-Fi 22-23 530 MX-Fi 22-23 250 EN-F 22-23 450 EN-Fi 22-23 530 EN-Fi 22-23