These are Pen Refill replacements, which are made of PP material, making them not easy to break and leak. Suitable for sending it as a present to office stuff and teens, encourage them to study harder. A perfect present choice for your family, friends or colleagues, they will like them a lot. Features - Color: Blue -Material:PP - Size: 11.50X0.40X0.40cm/4.52X0.16X0.16in -Ink Color:Black -The pen tip is practical and smooth writing, easy to move and replace, and can be used at will. -The unique design and detailed craftsmanship ensure its popularity and practicality. -With and price ratio, this gel pen refill is worth having and is suitable for daily writing. -There is no ink leakage, can use these gel Pen Refills with confidence. -A great birthday present and stationery for teens, letting them study and draw pictures happily. Package list: 60 Refills