This paper is based on the assumption that the most plausible metaphysics behind the scientific image of the world is causal realism. A theory of causality is defended within the framework of the new mechanical philosophy, and therefore, in terms of mechanisms. This theory is substantiated on properties, dispositions and powers. In sum, the paper aims to show that causality operates through mechanisms formed by entities whose properties have the power or disposition to affect other properties (through interactions), thereby producing certain effects; and this is what causation means. The analysis is situated within new dispositionalism, but shies away from new essentialism, showing that a causal ontology of properties (causal powers) can be sustained without recourse to essentialism.