This is a case for a 30cm ruler used at school. Some children carry them as is, but to protect the corners and keep them safe, it's best to put them in a case. Size: 31.5cm (below the drawstring) 5cm wide Fabric: Oxford cloth Navy blue with tricolor tropical fish. If you're starting the new school year, please consider this. If you change from anonymous to regular mail, the price will be 310 yen. Please contact me before purchasing so I can correct the price.