This magnetic fuel saver stops scale build-up and corrosion in engine. Reduced wear on O2 sensor and catalytic converter. It can save 10%-25% fuel. 50% reduction of carbon monoxide and hydrocarbons. Helps pass emission testing. High octane performance with lower octane fuel. Let your car run more miles per gallon and reduce emissions. Applicable for most kinds of cars. Will improve engine performance. Clean air, save fuel, save money, more miles per gallon. Easy to install: No tools or cutting of fuel lines required. Install magnet as close to engine as possible. Magnetic fuel savers are held in place by the cab. Type: Magnetic Fuel Saver Material: Plastic, Magnet Main Color: Yellow Features: Easy to Use, Fuel Saver, Magnetic Fuel Economizer Size: 37mm x 29mm/1.46" x 1.14" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 2 x Magnetic Fuel Saver (with Tighten Band)