This erasable pen is perfect for school, featuring a built-in eraser! The pen's tip makes it easy to erase what you've written. No need to worry about forgetting or losing your eraser – this pen is designed to correct mistakes. The pens have a sleek design with precise tips, making them easy to write with. The blue ink dries quickly and isn't easily affected by temperature changes, so it won't smudge when signing important documents. This set includes 4 pens in different sizes, each featuring a cute animal design that users are sure to love. The pens are great for taking notes; easily erase simple mistakes with the built-in eraser. The animal designs – a pig, panda, mouse, and teddy bear – will encourage users to enjoy writing and drawing. Learning is fun! The pens use a smooth, black ink cartridge. This is a great solution for children who are transitioning from pencils to pens. The writing line thickness is 0.35 millimeters. An erasable pen is definitely a great solution because it doesn't create messy smudges.