Constructed from strong ECT-44 singlewall kraft corrugated. Holds 4 - 1 Gallon F-Style cans. UN Number: 4G/Y51.4/S. Use these containers as refills for foam shipper kits. Cartons are printed with mandatory warning information. "This side up" arrows are printed on 2 sides of the carton. Cartons ship and store flat to save space. In accordance with CFR 49 178.601B, shipper is responsible for choosing the correct packaging for product and for final closure. CONSULT APPROPRIATE REGULATIONS.