Not sure I understand your question, but besides weight and being sensitive (more of the first, less of the second) what makes glass a good choice for larger treble lures, and certain other moving baits is the recoil speed. When bent, a glass rod doesn't want to straighten as quickly as a graphite one. Makes for a better fish fighting rod, at the expense of a working a lure and detecting bites rod. As far as action, a rod of any action can be designed from either material.