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Break-resistant.
Staedtler pen leads are break-resistant and suitable for all mechanical pens. Mechanical pencil leads for paper and cardboard.
Staedtler fine refill Mars Micro Carbon 250. Almost unbreakable. For writing on paper and cardboard paper.
Suitable for all retractable pencils.
Hardness: HB. Line width: 0.5 mm. Quantity: 12.