Take this stuff to a high quality shop that has a refrigerant identifier and have them open and test one of the cans. Its quite possible its 134a, but without testing, you cannot know for sure.

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Matt
2003 Jetta Wagon TDI 145,000MI
1999.5 Jetta TDI 287,000MI
2001 Suzuki SV650S 26,000MI
2008 Yamaha Vino 125 11,000MI
http://www.crazymatt.org