This ruler is made of high-quality hard bamboo with a smooth, burr-free surface, ensuring durability and preventing cracking over time. Featuring dual graduations—12 inches and 30 centimeters—it's ideal for precise measurements. The double beveled edge design makes the graduations clearer and easier to read. Suitable for home, office, school, and even lab or DIY projects. Free sea freight on orders of 10,000 pieces or more. 100% quality guaranteed