... drawing pen 510/520/610 for led writing boardIt's best choice for the LED writing board Specifications: 1 ... the loss of too much ink. 3. Writing or drawing, , keep nib down, otherwise the ink can't flow 4. Nib design for ... tow, one for the oblique head, another for the round, exchange the nib can be written ... ages 3. Avoid sunshine 4. Please cover the nib after used, place in dry place. ...