Create Endless Castles & Dungeons! Castles, Crypts and Caverns Books of Battle Mats build on our experience of creating Battle Mat books, and has these key features: Presented as a 2 book set in a soft slipcase 2 modular books each with 40 map pages Lay flat wipe clean battle maps Create up to 24” x 24” battle map areas Easily storable and portable book format 1 inch grid throughout Beautifully detailed maps Reduces game preparation time Eliminates the need to draw maps in game 360° spine can fold in half if space is tight Each page is a map Opposing pages work together Just open & Roll! This is a hobby product and not a toy. Manufacturer's age recommendation is 14 years and up.