Help with sledgehammer prop

[SaraFS]

Hi, I am going to a con this summer and for my cosplay I need to make a sledgehammer prop. I am not sure what material would be the best for making the metal part of the hammer, since I obviously cannot bring a weapon made of metal to the con.
On their webpage they recommend using materials such as jackofoam, which I am considering using. The thing with jackofoam is that I have never used it before and I am unsure how to use it, also I do not know if it easily get dented.
Is jackofoam an okay material for this or are there any other, better, materials I should rather use?

 

[ataris121]

PVC pipe, Pipe insulation, DAP contact cement, A yoga block for the head, Plastidip. Look the Plasti Dip artists group up on facebook and read through the FAQ. If you have questions we can probably answer them there

 

[SaraFS]

Thank you

 

[Crimson Prime]

I made a sledgehammer a while ago for an abandoned project, for the head I cut two octagons the size I wanted the faces of the hammer from foam board then stuck strips the width of the sides on and filled with expanding foam, lightweight and sol;id.