Pilot Latte Gel Ink Pen - 0.5 mm - Pastel Color Series - Blue

I like!
Haven't tried many surfaces, but it does write on plastic.
Ink flows beautifully!

Love the entire line of these pens. The color selection is great and the quality is superb.

do these pens write thick or thin?????????

I was expecting something similar to Sakura Glaze pens, but these are different. The colors are brighter than you'd think, too.
I tried writing on different materials: YES, I really did test every claim. They write on regular notebook paper, glossy magazine covers,patent leather, vinyl, wood, coated and uncoated cardboard, plastic ( the case the pens came in, for ex.) enamel-coated metal, glass, Pyrex, and stainless steel.
They write on shiny metal and plastic but some of the shiniest, smoothest surfaces will cause the ink to bead up via surface tension. When other reviewers complained of these "not working," they probably were experiencing the same problem as I did when some pens simply refused to put ANY ink out. All you have to do is draw straight lines quickly on an absorbent surface, like regular notebook paper, a paper towel or a scrap of fabric to get the ink flowing again. Just one or two quick swipes is all it takes. They really DO write on almost everything!

this white pen writes perfectly on plastic surfaces, but, in paper, its useless...