The Qatalitic Steel Straight ruler is made of good quality steel, durable and sturdy. A good measuring tool, easy and convenient to all. Well Grinded & Well Polished & Thicker Side. More grinding and polishing process than other suppliers to ensure the inside edges is not sharp, much more safety to you and your kids. Thick thickness is not easy to bend. This ruler is sturdy, handy and longlasting. Inch and Cm marking are exactly on the ends, unique design, measurement can begin at zero and scale at end for rule, you can make measuring directly and into any corners. Stainless steel rulers is made of Antiglare Satin chrome finish Comes with Metric Graduation on one side and Inch Graduation on the other side.