We're not sure if mermaids have much use for pens but we think this would definitely be a fan-favourite if they did! The barrel is decorated with a textured holographic shell design & it has a metal clip to attach it to a notebook or diary. It writes in black ink & has a retractable nib using the click mechanism on top. Refills are available which is good news because you'll love writing with it! Pen measures (approx) 140mm long.