For use in R-134a and R-1234yf systems; Super concentrated dye detects leaks quickly, saving time and money; Added friction modifier and anti-wear additive improves efficiency and reduces wear; Antioxidant stops acid formation and prolongs oil life; Cartridge works exclusively with theSpotgun Jr.™ injection system; UnitSize:0.25 oz/7.5 ml; Max.Applications:1 vehicles; Quantity: 6