Let K, H be real Banach spaces
with strictly convex duals, and let X, Y be any real Banach spaces. In this paper we
find a general form of isometries between the Banach spaces X⊗K and Y⊗H. As a
consequence we obtain that X⊗K and Y⊗K are isometric if and only if X and Y are
isometric. We also derive a theorem characterizing Banach spaces with a trivial
centralizer.