Stillman & Birn Epsilon Series - Wirebound Sketchbook - Portrait 9 x 12 - 150gsm White PaperHEAVYWEIGHT PAPER: Strong enough to use wet media on both sides of page. Great for fine line artwork and technical drawing with ink wash. CRAFTED FOR MIXED MEDIA: Double sized (from non animal materials) for enhanced wet strength and glowing color. ERASABLE & TOUGH: Withstands multiple erasures and holds up well to layered light washes of wet media. DURABLE: Thick board, premium coil wire binding with secure closure, and heavy duty art paper equals a