Shaft Weight vs Flex: Which One You Actually Feel
Weight is published in grams and means the same thing everywhere. Flex is a label with no standard behind it. Only one of those is a specification.
shaft flex
The Golf Club Spec Sheet, Translated: What Each Number Does
Loft, lie, head weight, volume, swing weight and shaft. What each number on a golf club spec sheet decides, and the four things the sheet never tells you.