Features: No Harm Color: Soft multi-color crow highlighter that does not hurt your eyes and will not distract you and improve your learning attention. There are 12 colors or 24 colors for you to choose. Use Method:Shake the pen barrel about 6-10 times before use to mix the ink well. Press the nib upward 2-3 times to expel the air in the pen barrel. Press the nib down 4-6 times and the ink flows to the nib you can write. After writing the pen should be capped as soon as possible to prevent the nib from contacting the air and curing. Convenient to Apply: Smooth writing rich colors fiber nib allows the ink to flow naturally allowing you to write smoothly. The highlighter fits nicely in your hand for easier use.When used correctly it will not bleed out unless very thin paper is used or very hard when applied. Wide Application: Use for journaling planning working studying note-taking annotating etc. Suitable for use at school at home at the office and even when traveling.Double line pen can be drawn on clothes glass stones ceramics and other objects but the double line effect cannot be rendered on glass stones ceramics and dark paper it is only fluorescent effect. Customer Service:If you confront any problems about our products please feel free to contact us we are ready to help. We will solve your problems as soon as possible. Specification: Material: Plastic Pen Size: 1.2*13.2cm Package Size: 14*13.5cm (12pcs) 28.5*13.5cm (24pcs) Quantity: 12/24pcs Notes: 1. Due to different monitors and lighting effects the actual color may be slightly different from the image. 2. Due to manual measurement please allow 1-3cm deviation. includes: 12Outline Marker Pens OR 24Outline Marker Pens "