Arches Block 140LB Rough 7.9X7.9 Professional grade watercolor of the highest quality. 100% cotton&#44; cylinder mould made with natural gelatin sizing. Flawless textured surfaces of cold press&#44; hot press&#44; and rough with deckle edges&#44; acid Contains an antimicrobial agent to help resist mildew. 300g Arches Watercolor Paper Rough - Natural White.