... and other paper and plastic products .we own the Germany envelope machine.And the output can reach to 4 million pieces per ... client's request,with/without gum,self-adhesive .3.Wallet envelope:80-120gsm offset paper,min size:80*120mm,max size ... seal.with or without window as your requirment .4.Pocket envelope:min size:100*150mm,max size:252*380mm,with/without ...