Maxima Racing Oils AFR-2401-00 ProFilter Ready to Use Dual Stage Foam Air Filter, Single Yamaha M/C YZF 250 01-11/YZF 450 97-09/WR 250/400/426 97-02/YZ 125/250 97-11 Bonded dual-stage open cell foam matrix with 6 millimeter outer foam and 10 millimeter inner foam layer Washable and re-useable, with high strength glued seams that won't fall apart Pre-oiled with Maxima FFT filter oil Complete with disposable gloves and packaged in a resealable bag