K&N replacement air filters are washable and reusable and provide high air-flow with excellent filtration. Features Designed to provide increased horsepower and acceleration Pleated cotton media provides a large filtration area offering low restriction high-capacity and long service intervals Multiple layers of woven cotton gauze media offer excellent filtration Fits directly into OEM airbox with an application-specific sealing bead ensuring a precise fit No fuel management modifications are required to obtain increased performance Washable & reusable most are pre-oiled and ready to ride Specifications Filter Material: Cotton Gauze Height: 1.531in (39mm) Outside Length: 4in (102mm) Outside Width: 3.344in (85mm) Filter Re-Oiling Amount: 0.27oz (8ml) Washable: Yes Fits: BMW G310 GS 40 YEARS GS EDITION 2021 G310GS 2018-2022 G310R 2017-2022