Sets provide storage for your technical pens in a convenient hinged-lid case with pushbutton release. Seven pen set includes one each of 0.25/3x0, 0.30/00, 0.35/0, 0.50/1, 0.60/2, 0.80/3, 1.20/4. Set also includes a bottle of Koh-I-Noor waterproof, black India drawing ink and nib keys. Four pen set includes one each of 0.30/00, 0.35/0, 0.50/1, 0.60/2, and universal ink.