  We show that if $K$ is a compact metrizable space with finitely many
accumulation points, then the closed unit ball of $C(K)$ is a plastic metric
space, which means that any non-expansive bijection from $B_{C(K)}$ onto itself
is in fact an isometry. We also show that if $K$ is a zero-dimensional compact
Hausdorff space with a dense set of isolated points, then any non-expansive
homeomorphism of $B_{C(K)}$ is an isometry.
