Just call me Murphy is ok.
Thanks for your quick response and also it is my honor to talk with you.
Actually there are two types of machine may be suitable for your plastic products.
1, MY-M20F-II, the laser of machine creat chemical reaction on plastic material, then cereat black or gray or some other color effect.
2, MY-M20C-II, the laser of machine sublimate the surface of plastic material, then leave the mark(engraving effect), engrave more times, the mark(engraving effect) will be deeper and deeper.