Classes usually only apply to SDHC cards, and are only class 2, 4 or 6 - 2 being the slowest.
Wikia SD page
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Originally Posted by Wikia
SDHC cards have SD Speed Class Ratings defined by the SD Association. The SD Speed Class Ratings specify the following minimum write speeds based on " the best fragmented state where no memory unit is occupied": [19]
- Class 2: 2 MB/s - 13x
- Class 4: 4 MB/s - 26x
- Class 6: 6 MB/s - 40x
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