ADA 4-1/2" x 9" Self-Seal Envelope with Window for 1994, 1990, 1987, and 1985 Versions (500/case) Compatible with 1994, 1990, 1987 and 1985 Attending Dentist's Statement Versions; Envelope size is 4-1/2" x 9" Self-Seal Window Envelope; 500/case