We are a manuactuerer and having own trading company for PPGI,GI . The goods had adopted ISO9001:2000 Quality System Authorities and exported to more than 40 countries. All the based coils for PPGI are from our sister company:shandong guangyuan energy-saving material co.,ltd. We could give you our best price and good quality. Pls don't hesitate to contact with us if you have any enquiries on PPGI OR GI.