IM6, IM7, etc.... These are trade names for particular graphite produced by the Hexcel Corporation. These numbers are not industry standards or an indication of quality, especially since other companies use the designations to refer to graphite not made by Hexcel. At best, they allow you to compare the quality of the material used to build different rods by the same manufacturer. You can be confident that the IM7 rod would use better graphite than the IM6 rod if both are made by the same manufacturer. It's more difficult to say the same about rods from two different companies, since they could be made from material from completely different manufacturers.
You will not find IM numbers on composite rods/blanks, only on graphite.
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