... mainly used to make high strength chemical fiber tubes, yarn bobbins, industrial paper tubes for paper mill and plastic ... following:1. Substance: 230g/m2-600 g/m22.Grade: B,F200,F300,F400,F500,F600,F700,F800,F1000 ... diameter: 1000mm-1200mm5. Packing: Wrapped with vinyl film for waterproof, then core paper packed.If you have any ... send me your inquiry at any time. high grade core board for paper core