Feature●30" LENGTH ? Aluminum metal straight edge has embedded steel on both edges for extra durability and super hard cutting edge●NON-SLIP BACK ? Aluminum straight edge features non-slip backing for a stabilized grip during use as a measuring and drafting tool●DURABLE STEEL EDGE MEASURING TOOL - High-quality extruded aluminum is imprinted using photo anodizing process that makes for a uniform finish and color, through this process calibrations become a permanent part of the aluminum and will not wear off over time●INCH AND CENTIMETER CALIBRATIONS ? Aluminum metal ruler is calibrated in both inches and centimeters for flexibility in drafting and measuring●ALUMICOLOR IS QUALITY - Made with the highest quality extruded aluminum all straight edge measuring tools and rulers have smooth edges and are calibrated to exact specificationsDescription Alumicolor’s Non-Slip Steel Edge Straight Edges are made with extra wide 2" tempered aluminum with dual inking edges and neoprene non-slip backing. Embedded steel on both edges of the ruler provide extra durability and a super hard cutting edge. Stays in place easily with slight pressure and permanent calibrations resist being cleaned or rubbed off. Calibrated in inches and centimeters. Available in 5 sizes!