Durable hardwood craftsmanship (1" wide and 0.25" thick) Marked in metric graduations of centimeters and millimeters Clear finish protects the wood as well as the numbers and markings Great for the classroom Durable hardwood craftsmanship (1" wide and 0.25" thick). Marked in metric graduations of centimeters and millimeters. Clear finish protects the wood as well as the numbers and markings. Great for the classroom. Horizontal Reading. Centimeters and Millimeters. Eisco Labs proudly manufactures its own products using state-of-the-art equipment, and following the highest standards of quality control. Each product is carefully designed by a team of laboratory professionals and experienced engineers with quality and durability in mind. They are manufactured with only the highest grade, raw materials and according to international quality standards to ensure that they can withstand use in even the toughest laboratory environments.