Stillman & Birn Delta Series Wirebound Sketchbook, 7″ x 7″, 270 gsm (Extra
DELTA SERIES WIREBOUND SKETCHBOOKS Stillman & Birn Delta Series Wirebound Sketchbooks, 270 gsm (Extra Heavyweight), ivory paper, cold press surface. Acid-free, chloride-free, lignin-free. Stillman & Birn Delta Series Wirebound Sketchbook, 7″ x 7″, 270 gsm (Extra Heavyweight), Ivory Paper, Cold Press Surface.