An assembly comprising carbon foam and high density carbon foam is described. In some embodiments, such an assembly may be a composite or composite assembly. One or more pieces of carbon foam and high density carbon foam may comprise the assembly. The assembly may comprise other materials in addition to the carbon foam and high density carbon foam. One or more of any given type of other material may be incorporated into the composite. Additionally, a given other material may be incorporated in more than one volume or location on or in the assembly. The other materials may provide for bonding of the elements of the assembly together, strengthening of the assembly, increased assembly oxidation and weathering resistance, modification of the electrical, thermal, or fluid transport properties of the assembly, and any of a number of other purposes.