The gel refill writes smoothly, is water-resistant, and does not break the ink easily. There are three colors and you can choose 100 pieces. There are two types of pens, one is a full needle tube and the other is a bullet tube, which is suitable for student office, finance and family. This is a general-purpose type. The refill is the same as most refills. This refill is made of stainless steel, wear-resistant and drop-resistant, and can write smoothly and continuously. It is environmentally friendly in a PVC environmental protection bag, and the zipper is semi-transparent for easy storage. There are many types of refills for your choice.