The dinosaur black ink pen is made of plastic materials. The high-quality black ink refill can ensure easy and smooth writing without ink leakage. The type of nib is 0.5 mm, and the length of the cartoon gel pen is about 16-17 cm. It can be put in a bag or pocket, and it is light in weight and easy to carry. these novel cartoon pen sets are practical office and writing supplies, bringing convenience to your daily life, suitable for schools, homes, offices, etc.