Spare tubes for various pen kits.
Sierra/Gatsby Twist - 27/64" x 2.21"
30-Cal Bolt Action - 3/8" x 1.97"
The following Jr tubes fit most Jr Gent II family kits, includingthose from Dayacom.
Jr Cap - 12.5mm x 48mm
Jr Body - 10.5mm x 55mm
