Tombow Pencil Monograph Penna a sfera leggera a base di olio, 0,38 mm, inchiostro nero, 3 pezzi
Refill: BR-KNU33 (KNU oil-based ballpoint pen refill). The MONO Graph Light is an oil-based ballpoint pen with a clear, visible tip and smooth ink that produces a clear, dark line even in fine strokes.