Twin Air Foam Air Filter Honda CRF250 450R X RWE 2017 20 150224 gold The altered Block In A Block shape on 1403 3664 The altered Block In A Block shape on the rear tire allows for added flex in the knob to enhance grip while providing stability and slide control Honda CRF 250 R 2018 2019Honda CRF 250 RX 2019Honda CRF 450 L 2019 2021Honda CRF 450 R 2017 2019Honda CRF 450 RWE 2019Honda CRF 450 RX 2017 2019Honda CRF 450 X 2019 2021 greaseless sealing ring ensures maximum contact with your airbox while acting as a breathable gasket for increased air passage Coarse open pore foam catches airborn dirt Smaller than stock to increase air space and circulation around filter