Removable strip provides clean and quick seal upon contact. FSC certified®. Security artline. White wove. Side seam. 24 lb. #8. 3-5/8" x 8-5/8". Top window size: 7/8" x 3-1/2". Top window placement: 2-1/4" from bottom. Bottom window size: 1"x 4". Bottom window placement: 5/8" from bottom. 500 per box.