Removable strip provides clean and quick seal upon contact. FSC Certified. Security artline. White wove, open side. 24lb.  #9. 3-7/8" x 8-7/8". Top window size: 1-3/16" x 3-1/2". Top window placement: 2" from bottom. Bottom window size: 1" x 4". Bottom window placement: 1/2" from bottom. 500 per box.