Salt, Mineral Oil.
Attachment Instructions: 1. Insert the salt spool onto the salt spool holder's peg; the salt savor should spin freely on the peg. 2. Position the salt savor holder's E-Z twist grip handle horizontally between the spacing of the cage wire. 3. Turn the salt savor holder's E-Z twist grip handle into a vertical position to secure the holder to the cage.
Always refer to the actual package for the most accurate information