Dear Sir We have noted your requirement at go4worldbusiness and understand that you are looking for duplex board. We take this opportunity to introduce our company as  buying, selling intermediate. Thus please find below the specifications of DUPLEX BOARD of Chinese Origin. Kindly advise your complete requirement so that we can quote accordingly:  Product:  DUPLEX BOARD WITH GREY / WHITE BACKColor: GREY / WHITESubstance:180~ 500 GSMProduct Specification:Basis weight250300350400450CD basis weight variation 5Moisture7.0±1.57.0±1.58.0±1.5Caliper300±10370±10430±10490±10550±10CD caliper variation5Smoothness50CD stiffness 2.84.87912Folding endurance 15Cobb size Top50bottom100Dust 0.3~1.5m m2601.5m m2Gloss78Surface gloss 20Ink absorption24±5IGT speed0.8(middle viscosity ink)Remark substance range: sheets:-3%24~+5%; roll:-5%~+3%PackingStandard exporting packing:Paper roll wrapped with PE filmed kraft paper;Sheets wrapped with PE filmed kraft paper with 4 angles protector baled on strong wooden pallets.Shipping InformationConveyance:by sea,by air...etcLoading quantity:20'FCL:18MT;40'FCL:25MT We look forward to hear from you favourably. Best Regards/Manzoor Ahmad