Material:made of zinc alloy, has good mechanical properties and wear resistance at room temperature. Fit:This kit fits most ATV Go Kart Dirt Bike, such as , ,SSR,Baja,Honda,Buyang, Coolsports, AIM-EX, Kazuma etc., not fit for all Honda XR70/XR70R/CRF70/XR80/Z50 and early model than 2008 for CRF50 XR50. Mounting bolt dimension: 47mm,the air filter interface outside diameter:37mm,Intake inside diameter:19mm. Package includes:1pc PZ19 carburetor + 1pc 35mm air filter + 1pc fuel filters + 2 adjusting shims+ 1 rubber ring+2 oil pipes+4 clasps+1 spark plug NOTE:Fit for 4 stroke 49cc-125cc horizontal engine,not for GY6 engine or vertical engine,hand choke carburetor not for cable choke or electric choke carbfits: Honda ST70 Honda NH80 Honda CT90 CT110 Honda CRF50 CRF50F 50cc 2008-2012 Honda CT70 Trail 1971-1982 Honda XL70 Motovox MVX70 SSR 72cc 80cc 110cc 125cc 4 stroke 49cc 50cc-125cc