The information of NEOACT double line outline pens 1、Size: Single is 13. 6 cm 2、Material: plastic + refill Usage Instructions: 1、 Shake the barrel with tip upward every time before use 2、 Ink come out after 3 times continuous press tip on paper 3、 Please recap immediately after use to avoid volatilization 4: 、Suggest to write on paper with 80gsm above, otherwise slight strike through will happen. 5、 Ink is suitable to use on light color cardboard papers Warm tips: The first time you use it, you need to press the tip of the pen to let the ink flow out 1、Please close the pen cap after using to prevent the ink from really evaporating