1. Enough paperboard weight from 250gsm to 450gsm,it is not easy to be broken
2. Good stiffness and No deformation
3. It is sticked by the high quality hot melt glue to ensure the envelope be strong
4. Beautiful and high precise printing
5. The bonding is very strong, it will not be explosive even hold more goods into it
6. The easy-tearing tape at the close lid to make the envelope be opened easily