A brass ox is one of the more substantial shapes in Chinese counter decoration: a real casting, usually solid, with the muscle definition worked in rather than left smooth. This one is cast in a single mould, then polished and selectively darkened so the form reads in low light.
At 880 g it is genuinely heavy. That is the honest test for this kind of object — hollow versions and resin-filled versions are common at lower prices and feel wrong in the hand. Felt pad on the base.