Given a sequence $(E_n)$ of Banach spaces, we characterize in this note the $(V^\ast)$-sets and other related classes of subsets in the space $E=(\sum\oplus E_n)_p$($1\leq p < \infty$ or $p=0$). As a consequence, we prove that $E$ has the Pelczynski's property $(V^\ast)$ if and only if so does every $E_n$.
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