I am in the market for a new distance feeder rod and was looking at the Cadence CR10. I notice that it comes bundled with two x 1.5 oz tips - one glass and one carbon. Given that they both have the same base diameter of 3.6mm, why would I need two tips of identical diameter? What is the difference between the glass tip and the carbon one? Your words of wisdom and knowledge are eagerly awaited, thanks!