our main product are as follows:

Water Erasable Pen
Air Erasable Pen/Auto Vanishing Pen/Disappearing Ink Pen
Silver Refill Pen

These product are widely used for :

Fabric/ cross stitch/embroidery/patchwork/quilting temporary marking.
Shoe/ Leather/Real fur/PU coating/ Net clothing temporary marking
Paper/Stationery temporary marking.
Children drawing / scribbling