The Spotgun Universal A/C Dye is a diagnostic service tool designed for leak detection in automotive air conditioning systems. With a capacity of 1/4 oz (7.5 ml) and compatibility with systems up to 4lb, this product comes in a set of 6 cartridges. Manufactured by Spotgun, this A/C dye is effective in identifying leaks in the system, making it a valuable tool for mechanics and car enthusiasts looking to diagnose and repair issues with their vehicle's cooling system.