Columbian CO870 10x13-Inch Interdepartment Blue Special Attention Border String & Button White Envelopes, 50 Count For confidential routing of interdepartmental documents. Blue border with "SPECIAL ATTENTION" print to make your important correspondence stand-out. Long-life string & button closure designed for repeated use. Single-sided printing with a five column format. Heavy-duty 28lb recycled white wove material. Manufactured from recycled content paper with a minimum of 30% post-consumer material. Open end closure. 10" x 13" 50 envelopes