Made of pure 100% wood pulpor recycled pulp through special technique, its thickness is even and the performance is stable. C: tradepaper at 163 dot com, size: 70, 75, 80gsm 8.5*11, a4, 8.5*13, a3, 11*17, and gram: 80gsm&75gsm&70gsm Brightness: 94%~108%.