Subsequent treatment process: 
Vacuum Heat Treatment: Compared with ordinary heat treatment, vacuum heat treatment has stronger stability and less deformation.   
Liquid Nitrogen(The cryogenic process): makes the crystal more uniform.
Finishing: Sandblasted (Apply mink oil to clean and preserve its fresh appearance.)
 
 
We recommend using Punching Board (can be purchased here) with our Pricking Hollows.
 
This design has been registered with the Intellectual Property Office (IPO) UK under Pro Atelier Plus LTD and The China National Intellectual Property Administration (CNIPA).