Colour Name:Brass Triangle Ruler Size:140×120×70mm Wide Application: Ruler tools, gift rulers, bookmarks,Math geometry tool are useful tools in architecture, engineering, arts, designing and school use.Brass-made measuring tools is durable. Features:Oxidation of copper has, after years of use, with sweat and air oxidation in full, the color will be deep dark, especially in the summer, particularly high temperature, will speed up the brass oxidation, especially the part of the hand, because have been contact with sweat, high temperature condition.So when the advice is first used, after each use, it is recommended to wipe with a paper towel, so that a small amount of sweat can be distributed evenly over the metal.After a long time, a protective layer of ""pulping"" is formed.This way your brass product looks very good, has lasting appeal, has a sense of history! Design:Retro, portable, unique, environmentally friendly, safe
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