Premium Kraft Cardboard Mailing Tubes - 1-1/2" x 12" - 1.5" Opening Diameter 12" in Length - Case of 50 Shipping Tubes with White End Caps (1.5x12) Premium Mailing Tubes are Made of 3 Ply Spiral Wound Chipboard. Quantity: 50 Kraft Mailing Tubes with White End Caps White End Caps (Included) Fits Tight to Protect Your Shipment. Actual Overall Length is 1 Inch Longer to Make Room for the White End Caps. Wall Thickness: 0.60 in