Each month in academic format, July to June, features a different lively design depicting the holidays and seasons of that month. Reversible vertical and horizontal formats allow you to choose the format that fits your office space. Easily erases with a damp cloth for changing plans. Black water-soluble marker and hang tabs included. Not for use with permanent markers. House of Doolittle products are printed on 100% post-consumer recycled paper with soy-based inks. Since 1989 House of Doolittle has donated 5% of its profits to organizations that are working to create a more sustainable environment.