Whether you are drawing, sketching or writing, the rOtring Tikky graphic fineliner three piece pen set gives your ideas more detail with its performance. Each fineliner pen is filled with pigmented ink that is lightfast and water-resistant. This sketching pen continuously delivers smooth ink and is durable. Easily see when it is time for a refill thanks to the ink level window. This drawing pen set ensures you always have the pen you need to meet your needs.