These are cut paper cores that fabric was wrapped around. Diameter: 38mm, Inner Diameter: 35mm Lengths are approximately: 585mm, 570mm, 550mm, 445mm, 440mm, 400mm, 370mm, 365mm A set of 8. The cut ends are not very clean as they were cut with a saw, but they can be easily corrected with sandpaper, etc. For reference, the fifth photo shows a homemade Noh flute case made by covering the ends of the cores with fabric scraps.