Silicone-Aluminium-Iron-Silver-Gold Rainbow Stall, impenetrable defense FTW!
Silicone because of it's mushy-ness, Aluminium for it's flexible-ness, Iron for some more strength, Silver and Gold for it's shinee-ness.
I think I could insert Arsenic, Kryptonite, Tugsten, Palladium, some Promethium, Thorium, Terbium and more elements, since I'll make some unobtainium for BS. Maybe some more idea tomorrow