  Let $C$ be the middle-third Cantor set. Define $C*C=\{x*y:x,y\in C\}$, where
$*=+,-,\cdot,\div$ (when $*=\div$, we assume $y\neq0$). Steinhaus \cite{HS}
proved in 1917 that \[ C-C=[-1,1], C+C=[0,2]. \] In 2019, Athreya, Reznick and
Tyson \cite{Tyson} proved that \[ C\div C=\bigcup_{n=-\infty}^{\infty}\left[
3^{-n}\dfrac{2}{3},3^{-n}\dfrac {3}{2}\right] . \] In this paper, we give a
description of the topological structure and Lebesgue measure of $C\cdot C$. We
indeed obtain corresponding results on the uniform $\lambda$-Cantor sets.
