3-Ply Kraft Mailing Tubes: Reinforced Kraft Paper Mailing Tubes measure 48 inches high and 2 inches in diameter. These cardboard poster tubes are made of durable 3-ply spiral, 0.065" thick brown kraft cardboard. Designed to provide superior crush resistance for secure and reliable mailing Secure Closure with Tight End Caps: Our tube mailers feature 2 white plastic twist-off lids that close the tube from both sides, ensuring a tight seal. A notch on the cap's edge allows easy opening of the tube as needed. You can trust that our mailing tube caps will not fall out or be missing during transit and your artwork will arrive safely to its destination Carrier-Approved for U.S. Shipping: All major shipping carriers in the U.S.—USPS, UPS, and FedEx—approve and accept mailing tubes for shipment, though they are often treated as "irregular" or "nonstandard" packages Suitable for Various Items: Can be used for mailing or storing posters, prints, documents, artwork, blueprints, and similar rolled materials Your Cost-Effective Solution: These poster shipping tubes are a great solution for e-commerce businesses and individual artists, graphic designers, or photographers. Our poster tubes provide a cost-effective and efficient solution to protect items during transit and ensure they arrive in good condition to customers or galleries