The answer is balance. It's the weight and length of the blade relative to the handle, and it's what makes a razor feel front-heavy, back-heavy, or even.
A quick way to check it: open the razor and rest it on your index finger at the pivot point — if the head tips up or down, it's not well balanced. Temper, grind, and set are all separate quality factors that affect a razor's edge and feel, but none of them describes how the weight is distributed between blade and handle.
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