Professional grade paper with a rough tooth, sized to withstand repeated washes and scrubbings. The specially treated, neutral pH sheets enhances the brilliance of your watercolors. Has 15 sheets of paper glued together on all four sides and supported with a strong backing. Easy release corner allows you to slide a palette knife between the sheets for clean removal. Paint on each sheet, edge to edge, without having to tape.Details:White5" x 7" sheet size140 lb/300 gsm15 glued sheets with easy release cornersAcid freeNeutral pHPaper