This is the leather for a small drum (ko-tsuzumi). Diameter: 20cm Thickness: Front leather: Approximately 0.34mm (Images 2 and 3) Back leather: Approximately 0.25mm (Images 4 and 5) Both the "sen-tsuzuri" and "juuroku" (referring to the leather's stitching or construction) are in good condition. There are no tears in the leather.