I purchased some stropping felt and stropping leather from craftsmanstudio. Here is their site. Stropping Supplies
I made several bench hones using 1 and a 1/4" granite that I got from a local granite supplier. I had them cut the granite to the size of the stropping material using scraps of granite from their trash bin. The scraps were broken pieces for countertop back splash material. I applied the spray adhesive to the unpolished side of the granite and the back side of my stropping material. The thicker granite is heavy enough were is does not move when using the bench strop.
Good luck.