Magic Auto-Vanishing Ball Point Pen Invisible Disappear Ink

1) Looks just like normal pen 2) Great tool for magic trick 3) The word that wrote down by this pen will disappear within several hours without leaving any trace 4) Make fun to your friend with this pen 5) Color: Black 6) Net Weight: 10g 7) Size (Length x Width x Thickness): 140 x 15 x 10mm