NO TOIL manufactures the world's best 2-stage foam air filters. Using only the best flame-laminated dual-layer foam bonded with the highest quality glue they hand make each foam filter to stand up to the roughest and toughest riding or terrain. NO TOIL filters can be used with NO TOIL biodegradable clean in water cleaner providing the best air filtration system in the world. Fits: Husqvarna TC50 2017-2021 TC50 MINI 2018-2021 KTM 50 SX 2009-2022 50 SX FACTORY EDITION 2021 50 SX MINI 2009-2021 50 SX PRO JUNIOR 2009