I went to a paper supply store once looking for some heavy white cardstock. The clerk showed me cover and index, and the index is lighter than cover, even if the lb. weight is the same. I ended up with Neenah Classic Crest 110 lb. Cover. It is very heavy. I also have some Georgia Pacific 110 lb. cardstock from Walmart. It doesn't say cover or index, but it is so much lighter than the Neenah, that it must be index. If you want heavy cardstock, then go for the cover weight.
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