Properties of ultrasmall superconducting grains

We briefly review some properties of ultrasmall superconducting grains. The ground state and the first excited states of the grains are analyzed by st udying the parity gap and the spectroscopic gap. Both quantities turn out t o be parity dependent and universal functions of the ratio between the leve l spacing and the BCS gap, delta/Delta. Pairing correlations show up also i n the thermodynamic quantities. The presence of a BCS interaction is respon sible for an anomaly in the spin susceptibility as a function of temperatur e. This anomaly persists also in very small grains.