Comply with shipping regulations by using the labelmaster’s overpack labels. Overpacks containing dangerous goods are required to be marked with the word “overpack” in association with the proper shipping name. This rule is effective for international air and sea shipments; is required for shipment in the us. This rule is used very often for ground shipments. Printed on paper, these air labels have outstanding chemical and abrasion resistance, feature strong adhesion, and help keep you in regulatory compliance. They measure 6″ in length and 2-1/2″ in width. These labels are sold in rolls of 500.