Tombow Air Press N12 Full B BC-APN12 4901991130812 (5 sets)
Ball diameter: 0.7mm Maximum width 21 x total length 122mm 15g Tombow's unique pressure mechanism creates compressed air every time you knock and pushes out ink. Upward writing, speed writing, and writing on damp paper are also possible. ◆Ink color: Black ◆Oil-based ink ◆Mechanism: Knock pressure type ◆Rubber body ◆Blister pack included Shaft: PMMA resin/elastomer, Clip: Carbon steel