rOtring Isograph Technical Drawing Pens, Set, 3 pen set of high precision technical pens, perfect for College level students. - AliExpress
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Amazon.com : Rotring Centro Geometry Compass 250mm : Office Products
Buy ROtring Isograph Pen Set Technical Pen & Pencil College Set 3 Pens (0.20mm, 0.30mm, 0.50mm) and Mechanical Pencil (0.5mm) + Accessories Online at desertcartINDIA
Amazon.com : Rotring Centro Geometry Compass 250mm : Office Products