From the Star Shaving web site & included in their packaging

The Leather Strop is new, never used, tested and made by us, made in the U.S.A.; has a great draw and ready for razor stropping!
For Best Results use water and soap on the leather, such as your shave brush with shave soap. Also use the palm of your hand to rub the leather strop occasionally to help keep the leather pliable.
When the leather is not pliable use Neatsfoot oil and when the leather is dirty use Saddle soap.
Use a lint roller to keep the Linen strop clean.