These stationery items are so colorful and fun just to look at! They were a gift, but I haven't been able to use them because I feel they're too precious. I'm hoping they can go to someone who will use them... Although they are unused, please understand that they have been in someone's possession once. Thank you for your understanding. Please refrain from purchasing if you are concerned about minor details or are overly sensitive. The "fish" is a titanium ruler + letter opener shaped like a fish. You can use it as a ruler, of course, but also as a letter opener. You can put it in your pen case or pen stand to highlight your favorite color. The curved part has been polished so that it can be used as a letter opener, but it is not a blade, so there is no risk of cutting your finger.