Case of 12-8oz bottles. For use with the Motorvac CarbonClean Fuel system cleaner. Cleans the entire engine fuel system including fuel injectors, combustion chamber, intakes, etc.. Even out to the catalytic converter even. Removes deposits and gum from system. Filter removes all these contaminants, particulates and deposits and holds them in it's very capable 10 micron filter. You could use other detergents, but none will work as effectively, and may cost you more because you'll probably need to use more to perform an equivalent cleaning job. Price is when purchasing with machine.