These are fashionable syringe ballpoint pens. You can replace the cartridge. There can be movement of liquid, and harmless. Just buy these fashionable syringe ball pens to show your personality These syringe pens are also for sending gifts for your family or friends. Features - Color: as shown. - Material: plastic. - Size: About 113x0.8x0.8cm. - Fashionable syringe ball pen. - Makes a great gift or countertop accessory for your store. - Fully functional, contains variety of colors. -Children like to imagine how they can copy grownups; this pen is perfect to make believe they are acting as a doctor. Warm tip Dear buyer, Due to lighting effect, monitor's brightness, manual measurement and etc, there could be some slight difference in the color and size between the photo and the actual item. Sincerely hope that you can understand Thank you