13 the dimensions of post 13 may vary depending upon the application clearly the length of post 13 is tailored to the particular sign involved according to a preferred embodiment of the present invention which is a post adapted to be a delineator outer diameter of sleeve 21 is 2 375 inch and the wall thickness of the combined sleeve 21 and core 23 is 0 210 u2013 0 250 inch because the post is co extruded sleeve 21 is non uniform in thickness and wall thickness can vary between about 0 030 and 0 070 inch core 23 may be solid as well at some cost to material savings to support a sign of area less than 10 square feet post 13 has an outer diameter of 2 375 inch and a total wall thickness sleeve 21 and core 23 of between 0 400 and 0 500 inch as stated core 23 is formed of a polymer containing at least 10 u2013 20 by weight recycled crumb tire rubber the percentage of crumb rubber by weight can be varied to increase the stiffness and strength of the resulting polymer according to the preferred embodiment of the present invention the core material is made according to the following formula 25 u2013 30 by weight recycled crumb rubber of between 10 mesh and 40 mesh 70 u2013 75 high molecular weight high density polyethylene having a melt index of approximately 0 25 the polyethylene may be recycled and is a mixture of various melt index polymers to obtain the average melt index of u2212 0 25 this mixture is blended in a conventional blender together with 4 to 8 quarts of motor oil per 1000 lb batch using lower viscosity motor oil for larger crumb particle size e g for.