1 1/4″ diameter cork core with multiple felt layers and medium thick German felt ball cover. Round and warm sound with just enough clarity to be called a warm general stick. So far, most players that have tested this call it a “go to” general. *Break in period for this model is approximately 1 week of regular playing for the felt to relax a bit and become even further voiced naturally…or you can voice them more heavily before using if you wish.