  We consider the non Abelian sandpile model introduced by Y.-C. Zhang on a
two-dimensional square lattice. The static and dynamical properties of the
model are investigated and compared to the Abelian sandpile model of Bak, Tang
and Wiesenfeld. A detailed analysis which takes the finite size effects into
account yields that the exponents of the avalanche probability distribution are
the same as in the Abelian model.
