The 16242 UV Dye fluoresces dye from up to 50ft away. Brightest dyes in the industry to help find leaks faster, Exceeds all industry performance standards. OEM backed and approved & Compatible with all materials found in a vehicle's A/C system. Solvent –free formula, Meets the new SAE J2297 standard for use with both R134A and R1234YF and is REACH and CLP compliant. Twelve 1/4 oz. bottles, 12 applications. Includes Application Labels.