Alvin Mailing Tubes 43X6 Indg Bx/12, designed with industrial-strength cardboard tubing, moisture resistance outer surfacing, and metal ring framing on the ends, provide solid protection for paper media artwork. The slip caps are tight and won’t come loose. And the ends are reinforced for impact and denting to avoid damage to contents. With a 6 inch diameter, lots of paper media artwork can be stored and protected without worry. Each package comes with 12 tubes, so you will has plenty of supply to protect multiple art pieces.