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. Fits: KTM 125/150 SX 16-18, 150 XC-W 17-18, 250 SX 17-18, 250 SX-F 16-17, 250 XC-F/XC-W 16-18, 300 XC 17-18, 300 XC-W 17-18, 350 EXC-F 17-18, 350 SX-F 16-18, 350 XC-F 16-18, 350 XCF-W 16-18, 450 EXC-F 17-18, 450 SX-F 16-18, 450 XC-F 16-18, 500 EXC-F 17-18; Husqvarna TC 125 16-18, TC 250 17-18, FC 250 16-18, FC 350 16-18, FC 450 16-18, FE 250 17-18, FE 350 17-18, FE 450 17-18, FE 501 17-18, TE 125 17-18, TE 250 17-18, TE 300 17-18, TX 125 17-18, TX 300 17-18, TX 350 17-18, TX 450 17-18