lie substantially in the same plane in this manner a large number of tubes 10 can be placed over a winder with rim to rim contact between each tube and the next one without any element thereof protruding beyond that of the next tube in zones 34 e 34 and 34 f 34 the straight ribs 44 connecting rim elements with the last rings are very rigid to provide a zone of substantial noncompressibility it is envisioned that the tubular elements of the present invention are disposable consequently in the preferred embodiment they are fabricated by injection molding of a thermoplastic polymeric plastic composition such as by way of example polypropylene 34 lexan 34 carbonate resin or polyethylene preferably the length of segments 20 of the ribs should be about the same as that of portions 26 of rings 16 and 16 39 thus dimensioned segments 20 can collapse in the direction of portions 26 on impact against the tube and provide added rigidity in a successful embodiment of the invention a tube 10 measuring 11 inches was integrally molded from polypropylene material its diameter was about 3 inches groups a b c d comprised each 3 longitudinal ribs extending for about 9 inches between zones 34 e 34 and 34 f 34 rings 16 were about 1 16 inch thick while rings 12 14 and 16 39 were about 1 8 inch thick zones.