STAEDTLER Mars 561 Reduction Ruler | Manufactured with an engraving process: Dividings and figures have the same accuracy as the die; Dividings and figures are sharper and deeper, and are therefore permanent; Line thickness of dividing are controlled to give maximum clarity | Tough, flexible, climatically stable and will not discolour or become brittle with age | Anti-glare finish makes the scales easy to read | Colour-coded grooves for easy idenfication of scales | Impact-resistant plastic package | 6 scales on every ruler | Divisions: 1:20, 1:25, 1:33,3, 1:50, 1:75, 1:100