7 pen set KOH - I - NOOR RADIDOGRAPG Drawing Pens with INK & CASE & INST

Description

I know nothing about this sort of thing but I`ll describe this estate sale find pen set the best I can. There in used, very clean condition and are being sold As Is, What Is, All Sales Final. They consist of:
7 plastic, 5 5/16" long pens, marked on sides KOH-I-NORR RAPIDOGRAPH.
On pocket clips is KOH-I-NOOR U.S.A.
Marked on end of caps - 3x0/.25, 00/.30, 0/.35, 1/.50, 2/.60, 3/.80, 4/.120.
Comes in approx. 7/8" x 6 1/8" x 10" plastic case.
Has 3/4 FL OZ ( approx. 5/8 full ) KOH-I-NOOR RAPIDOGRAPH 3080-F UNIVERSAL DRAWING INK FOR PAPER & FILM WATER PROOF BLACK INDIA.
2 approx. 3/4" plastic pieces for ?? also marked KOH-I-NOOR U.S.A.
Also has instructions for filling, cleaning and point sizes.
Ink cartridges empty and clean.