class aaa to b grades grey back duplex board

{"cid":"91223323","title":"Industrial Use Moisture Proof Single Side Coated Grey Back Duplex Board Paperboard","imgUrl":"https:\/\/img.chinax.com\/nimg\/76\/5b\/a6b6b59b0a52b52f744dbb1238cf-200x200-1.jpg","attrs":{"Price":"$725.40-768.60","Brand Name":"XiaoLong Packaging","Model Number":"XLDB013","Minimum Order Quantity":"5","Place of Origin":"Guangdong, China, Guangdong, China","Paper Type":"Duplex Board","Pulp Material":"Mixed Pulp","Coating":"Coated","Coating Material":"Kaolinite","Coating Side":"Single Side","Compatible Printing":"Offset Printing","Pulp Style":"Recyclable","Pulping Type":"Chemical-Mechanical Pulp","Standard Size":"787X1092mm, 889X1194mm, 31X43inch, 35X47inch","GSM Range":"170~500","Thickness":"0.2mm~0.54mm","Grades":"Class AAA, Class AA, Class A, Class B","Package Style":"Sheets or rolls","Moisture Proof":"Yes","Custom Order":"Accept"}}