Stillman & Birn Delta Series - Wirebound Sketchbook - Portrait 9 x 12 - 270gsm Ivory PaperEXTRA HEAVYWEIGHT PAPER: Stands up to advanced dry & wet media techniques. Great for working in heavier washes or overlaying washes (glazing) of watercolor or gouache. CRAFTED FOR MIXED MEDIA: Double sized (from non animal materials) for enhanced wet strength and glowing color. ERASABLE & TOUGH: Accepts multiple erasures of dry media and lifting of wet media. DURABLE: Thick board, premium U. S. coil binding, and heavy duty art paper equals a