Uxcell 12-inch (30cm) Stainless Steel Straight Ruler Inches and Metric Scale Made of stainless steel material our rulers are rust-proof and very durable for long-lasting performance. Etched by high precision process and inked after that not just printing on it. Inch & cm & mm marking well easy to read and not to rub off. Practical tools for drawing & measuring in offices workshops architecture and engineering.