... of envelopes ( peel and seal ,self adhesive, ect) ,envelope making machines,cd sleeves/bags, red ... packets,tea bags, document bags,greeting cards,ect. We have our own factory ,R&D, sales department, and ... machine ect.Jinyou Envelope’s materials,quality and price:Most of our materials bought from ... is that we offer high quality goods and service with reasonable price. Also most ...