CPF publishes a list of CPF Investment Scheme options (OA and SA), and it’s available
here.
In my view you should not invest any SA funds in the CPF Investment Scheme since none of the investment choices are as attractive as traditional SA and its 4+% interest. There’s one exception: if you’re “shielding” SA funds for a very short period of time just before your 55th birthday in order to use more OA dollars to fund your Retirement Account.