BPE-9031 1pcs AVENGERS 0.7mm 10 Color Ballpoint Pen Press Push Style Cute Cartoon Ballpoint Pen Stationery

10 Colors: This pen likely features multiple ink colors, allowing you to switch between them by clicking or pressing different parts of the pen. It's a convenient tool for color-coding notes or adding a splash of color to your writing.

Pen Head: This suggests that the pen might have a design where you can see the different color options or perhaps change them easily. The “pen head” could refer to the area where the ink colors are housed.

Water Ball Pen: This term might be referring to a type of gel or liquid ink used in the pen. Water-based inks are often used in pens for smooth writing and vibrant colors.