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Paul,

What exactly is a muscleback blade?

Are Mizuno's MP-37 considered muscleback?

I thought it's either muscleback or cavity back (or hybrid)...and you can't have a cavity back blade can you?

Thanks!

http://www.benhogan.com/legacy/irontour.html

This link will give you examples of all sorts of clubs from the Ben Hogan line. It will show muscle backs, blades (both muscle back and non muscleback), so-called cut muscles, cavity backs, etc. I hope this is helpful.