Ruler is 0.7mm Thicker A+ stainless steel non-bendable but a little flexible, good for long lasting use engraving, concave scale design, with metric on side and on the other end Suitable for any environment, can maintain accuracy for a long for time Surface of the rulers are smooth with no burr, with a hole to make it easy for hanging, storage.Which keep your things organized This straight ruler is a useful measuring tool for artists, designers, architects, engineers, and students The markings are recessed a bit into the metal, so they will not rub off over for time, Manufacturer: Oxxggkao