Calculated off each grips weight we can see how much each material affects the weight of the finished grip. CFX is the lightest at 7 grams while the rubber polymer is the heaviest at 13 grams. These split grips sit directly under your hand on the rod and do very little to balance a split grip. The significant reduction in weight by using CFX grips can be felt and affects a fishing rods responsiveness and sensitivity.
Below we weight the most popular casting rod grips to see how much each weights. As you can see there is a significant difference in weight between various types of grip material.