MOQ:100 PCS. Support free samples and color mixed batch. Our professional design team will make proof for you free. The perfect way to thank your student for a great year or to send them on their way back to school for a new year. Just simply pressing the color tab you can switch color between 4 colors at will, including red, black, blue, and green. Suitable for painting art projects and Color coded text. One pen can solve different color marking needs, very simple and practical. The top has a horseshoe buckle, can be hung on the backpack, key chain, hook, etc., easy to carry. The case of the ballpoint pen also comes in different colors and is sent randomly with five to six colors, also four refills that can be easily removed by opening the lid and easily replaced when the ink runs out. It can be reused without waste.