STAEDTLER's Mars Micro Carbon refills are extra strong leads for mechanical pencils. This STAEDTLER refill pen is very easy to use. Open the mechanical stylus and insert the stylus. The pen creates non-permanent lines that can be easily wiped off many smooth surfaces, such as plastic, metal, lacquer and leather. The tip is perfect when you want broad, prominent lines. The pin is very durable thanks to its flexibility. It is made without PVC or plasticizers, making it an environmentally conscious option. - High breaking resistance thanks to flexible lead - Lead glides easily over the paper with jet black lines - Simple '12-a-go' refill for many - STAEDTLER mechanical pencils such as Mars micro 775 and graphite 779 - 12 pins per tube - ISO color coding

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