This is a set of 6 cardboard wrap cores. The types are mixed, but they are all cores from 30cm x 50m plastic wrap. Although the thickness may vary slightly, they are all very hard and sturdy. Please check the images. Size (cm) Length: Approximately 30.7 Diameter: Approximately 3.4 Please understand that there may be slight variations. If anyone is interested in using these and understands that they have been stored at home, please feel free to purchase. Please note that they will be shipped in simple packaging, with only water-resistant measures and placed in an envelope, without using cushioning material. Great for: Materials for handmade crafts and projects... Use in caregiving situations... Use during rehabilitation... Also useful for myofascial release.