Aviditi kraft crimped end mailing tubes. Economical crimped end mailing tubes seal by pinching the ends. Tubes are fast and easy to close and stay closed - no need for tape. Ends open easily allowing them to be reused. Tubes are also recyclable. Tubes are 3-ply spiral wound. Sizes listed are the usable inside space of the tube. Actual tube lengths are longer. Measures 15-inches length by 2-1/2-inches width.