TREND enterprises, Inc. The United States Wipe-Off Chart, 17" x 22" This dry-erase unlabeled United States political map is a handy tool for presentation and practice. Handy size can be easily viewed from a distance. Useful in large rooms and with small groups. Extra Value: reproducible activities on chart back. Durable cardstock. 17" x 22". Stores easily in chart- or bulletin board-size File 'n Save Box.