It takes standard size cartridges (one supplied with the pen) but can be converted to fill from bottled ink with a suitable converter (the Schmidt K5 is recommended).
Nib length = 17.7mm
Section length = 20.5mm
Section diameter (max/min) = 8.5/7.4mm
Barrel diameter (max) = 11.5mm
Total length (not posted, including nib) = 124mm
Weight = 19g