Note that the nib section of the Diamond Mini is not compatible with other TWSBI fountain pens (eg. Diamond 540, Diamond 580, Vac 700 and Micarta).
Nib length = 19.6mm
Section length = 19mm
Section diameter (max/min) = 10.0/9.4mm
Barrel diameter (max) = 12.7mm
Total length (not posted, including nib) = 108mm
Total length posted (including nib) = 140mm
Weight = 20g