This 15 cm ruler combines lightweight and durable aluminum with natural hay wood. Because it's a laser-etched scale that won't fade, it's long-lasting. There are two graduations, 0.5 mm on one side and 1 mm on the other, which can be adjusted depending on the application and measurement. Aluminum and wood metric ruler (using European Natural Hay) measuring 2 x 16 x 0.2 cm. Transparent aluminum and wood design.