Bumpers are made of what material?

High density foam

There's the foam bumper, then the RDX guys are using a thin kydex bumper under it... I guess that it all depends on which mfg you are talking about.

foam bumper material is what I was refering to.

Do you mean solid polyurethane foam?

you can get Parma foam.. cut to size..
depending on the car.. you can get 2 bumpers out of it..
http://www2.towerhobbies.com/cgi-bin...?&I=LXPUR6&P=7

high density foam
see link in above post


polyurethane foam might work as long as its very firm