NOTE: See my last picture of the air box this filter fits (it does not fit any other box). Air box not included, this listing is for the foam filter only. NOTE: I have three variations available (see below). Filter 1: OEM quality and will do the job. (In another listing) Filter 2: Better Quality, uses dual layer foam which has a coarse foam pre-filter to help keep the main foam from clogging. This one also uses higher quality foam that will last longer than the OEM filter. (In another listing) Filter 3: (This Filter) Better Quality, extra thick 20mm foam. This one also uses higher quality foam that will last much longer than lower priced filters. NOTE: Filter 2 3 are equivalent quality (just depends which you prefer). Warning: All foam filters require filter oil to do their job. I highly recommend PJ1 filter oil or another quality brand. Engine oil will work but it runs off and makes a mess and eventually your filter will start letting dirt into your engine. Clean your filter with dish soap and warm water, (never use gas, it can damage the foam). I have over 14K miles on my GY6 50 and never even adjusted the valves! Take good care of your motor and it'll take good care of you.... Partial List of Makes Models that use this engine: Baccio SPD 50cc Baotian: 50QT-11, Dotera 50QT-9, 50QT-11, Jalon JL50QT-18, BT49QT, BT50QT-9, Ecobike BENZHOU YY50QT: City Star 50, BUFFALO, Wind ERING, Sprint 50, JIN LUN, JL50QT KARCHER KM 50 Baja Powersports: Baja SC50, Sun City, Primo (PEP BOYS made by Zongshen) Falcon: JL50QT-15, JL50QT-16 Fly Scooters: Icebear: Maddog 50cc Jmstare: Accipiter 50, breeze 50, eagle 50 Kreidler: Flory 50 Kymco: Agility, MMC 50, Filly 50, Vitality 50, Nexxon 50, People, Super 8, Vivality, New Dink, Yager, Linhai: MSK: Ecobike 50 Pantera: Freedom, Fusion and Retro Metropolis, Viva City, Big Max, Comet Star Star 11, PMX, V-CLick QUINGQI: QM50QT-6A, koala qm50qt-6d REX: Capriolo 50, Flory, RS 450, RS 500, Off Limit 45 RIEJU: Paseo 50, Toreo 50 Roketa: Bahama, Maui, Sicily, Gamax Spillo Sachs: 49er 50, Bee SANILI TS50QT-4 Sinski: XSJ50QT-6, Sinski XSJ50QT-B Shanghai Shenke: EVO 50cc Strada: RX 50 (4 stroke) Powersports Factory, Jalon JL50QT-21 Sunl: SL50QT-16, SL50QT-16, SL50QT-18, SL50QT-2, SL50QT-3 TaoTao: GT5, Fastwind, atm50-a1, cy50-a, cy50-b, cy50-t3, funny 50, Roman 50, Retro 50, Speedy 50, Venus 50 Taishan: Commuter, Zhong Hu Tank: Sports United Motors: Longbo, Velocity: 50, 49cc Vento: Verucci: VC50TS-3M VIP: Future Champion XINLING ZHONG: YU 50 QT-5 ZHONG YU 50 QT-7 ZHONG YU ZY 50QT Zongshen: Metro 50cc, Wind 25/50, ZS50QT-4 50, Baron 50 Many more..... this list is continually growing....