Aviditi M3330 Corrugated Square Mailing Tube, 30" Length x 3" Width x 3" Height, Oyster White (Bundle of 25) Square tubes will not roll around which makes them easier to pack and ship than traditional round mailing tubes These one piece tubes ship flat to save space Tubes fold together fast without tape or glue Constructed from 200#/ECT-32-B oyster white corrugated Measures 30-inches length by 3-inches width by 3-inches height