Rapidograph 7-Pen Tech Pen Set
Sets provide storage for technical pens in a convenient hinged-lid case with push button release. 7-pen set includes one each of 3x0, 00, 0, 1, 2, 3, and 4 pens, a bottle of Koh-I-Noor(R) waterproof, black India drawing ink, and two nib keys. 4-pen set includes one each of 00, 0, 1, 2 pens, and universal ink.