Crescent Creative Products RENDR Lay-Flat Soft Cover Sketchbook, 8.5-Inch by 11-Inch Lay-flat binding limits Bump in the middle of the book allowing you to use both pages as one large sheet Render no-show thru technology allows you to use every side of every page Ideal for most art media. Perfect for markers Heavy duty smyth-sewn binding 110lb./180GSM, acid-free, Two-Sided sheets