12 oz. Arctic Freeze® Ultra Synthetic" R-134a+ Refrigerant
From it's website:
http://idqusa.com/proddetail.php?prod=AF-3
Arctic Freeze® Ultra Synthetic
Replaces lost refrigerant & oil to A/C system and is formulated with advanced QwikBoost® chemistry that was developed for NASA
Colder air 50% faster
It says it delivers colder air and faster. Now that it's ~100 degrees again, and I've had the stuff in the car for over a month, I can say that this product does deliver. The air is so cold even when it's this hot, I really only need the fan on a medium to low setting, even in full sunlight (once I have gotten the car to a stable temperature).
I bought it at Walmart.