Our CFX proprietary cores have a seven pound density with uniform, micro closed cells that amplify vibration. Unlike cork and EVA foam which absorb vibrations and sound waves our CFX cores transfer vibration and sound through the materiel. The weight of our cores is similar to 3 lb density pour foam, has higher strength and is over half the weight of any other core material being used for these types of grips. CFX cores are free of voids, concentric and ready to shape. CFX foamposite cores are 15" long with a 1.15" OD and weigh 0.7 oz.