the paper core are made for Textile industry as the core of DTY yarn. generally the thickness of the paper core at 3~5mm, lenght 200~350mm with inner diameter 50~80mm. 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.