Size: 225 x 181 x 26mm: Ruler Size The ruler is 225mm x 181mm x 26mm, a size that is easy to hold and use. Color: Yellow: The ruler is yellow, making it easy to see and use. Material: Plastic: The ruler is made of durable plastic and can be used for a long time. Unit Conversion: Area, volume, length, weight, liquid volume: The ruler can convert various units and is helpful for elementary school students' arithmetic. Thank you for viewing. My child used this often when they were in elementary school. It's been over 5 years. Please understand that this has been stored at home, and consider purchasing accordingly.