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IsoGraph Technical Pens offer high precision, and come with refillable ink reservoirs and come in 13 line widths. These Pens sets are a very popular way to start off with IsoGraph pens.
Rotring Isograph College Set (0.20 / 0.30 / 0.50mm)£43.99Add to Basket
Rotring Isograph College Set (0.25 / 0.35 / 0.50mm)£42.99Add to Basket (6)