Product Description   size: 210mm x 297mm   brightness: 100%   whiteness: CIE 167   Thickness: 110 um   Opacity: 95%   Roughness: 140 ml/min   Sheets/Ream: 500 sheets   Reams/Box: 5 (217mmX280mm)  Features and Benefits:   1. Excellent image clarity & contrast.   2. High opacity and thickness.   3. High performance for both side printing/copying.   4. Optimized smoothness on both surface.   5. Uniform toner/ink absorption to provide good print evenness.   6. Paper dimensionally stable.