Medium Church Hill model out of 4 Color Nebula alumilite.  Material has blues, oranges, purples, and some silve/black areas with chatoyance throughout.   Pen comes with your choice of nib finish and size, converter, and Rickshaw pen sleeve. Measurements Closed: 143mm Opened: 130m, this pen does not post,  Diameter: 16.25mm at the widestst , Section diameter: 11.75mm at the threads, tapers down to 10.5mm at the narrowest.  The pen can be eye droppered with use of silicone grease on the threads.