A stabilizer system for polymers comprising a mixture of(a) at least one hindered amine represented by the formula ##STR5## where R, R1, R2 are the same or different and each is an alkyl group having from 1 to 6 carbon atoms such as methyl, n-propyl, n-butyl, t-butyl, t-pentyl, t-hexyl, R3 is an alkyl group having from 1 to 12 carbon atoms, and n is an integer of 1 to 4 and (b) at least one metal