the paper core are made for Textile industry as the core of POY yarn. generally the thickness of the paper core at 3~5mm, lenght 110~230mm with inner diameter 75~140mm. in order absorbing the oil produce by yarn, the outter paper is using the parchment. where the color made to mark the yarn type. at the side of the paper core is slotted in order to hook the yarn. the paper core need made in high resist compression in order to prevent the yarn broken.