Stillman & Birn Nova Series - Softcover Sketchbook - Portrait 8 x 10 - 150gsm Black PaperHEAVYWEIGHT PAPER: Strong enough to use wet media on both sides of page. Example usage: ink underdrawing followed by layers of gouache. MIXED MEDIA TONED PAPER: Double sized for enhanced wet strength, yields high contrast and glowing color on toned paper. ERASABLE & TOUGH: Withstands multiple erasures and holds up well to layered light washes of wet media. DURABLE: Premium U. S. sewn binding, deluxe covers and heavy duty art paper equals a sketchbook