3-ply spiral wound construction for added strength Great for storing or shipping posters, blueprints and more. Included white endcaps snap into place to secure contents inside. Each size indicates usable space (actual tube length is greater) . Tubes are reusable and recyclable. Greener choice - contains 98% total recycled content with 87% postconsumer recycled content. Office Depot (R) Brand White Mailing Tubes With Plastic Endcaps, 2 1/2in. x 12in., Pack Of 34 is one of many Mailing Tubes available through Office Depot. Made by Office Depot.