Reversible vertical and horizontal formats allow you to choose the format that fits your office space. Extra-large daily squares offer ample writing space. Readable from up to 20 feet away! Easily erases with a damp cloth for changing plans. Black water-soluble marker included. Weeks are numbered. Sheet Size: 18 x 24; Page Color/Theme: Blue/Gray; Calendar Term: 12-Month (Jan.-Dec.); Edition Year: 2011.