If you ever find yourself needing to replace your felt squares for your Tim Holtz inking tool, just purchase a sheet of felt.
Michael's, Joann's & A.C. Moore all sell them individually & in packs. The singles usually run for approximately anywhere from .25 cents-.39 cents a sheet. The non adhesive backed felt will grab on to the existing velcro on the Tim Holtz inking tool just fine. Adhesive backed felt is available for purchase as well but not required when replacing your existing felt pads for the inking tool.
You can cut up the sheet which is usually an 8 1/2x 11 or 9x12 size sheet and get a lot of felt replacement pads out of one sheet. By the way, you can also find rolls of it at the fabric stores. So it is widely available, inexpensive & you get a lot for a little money.
It comes in a variety of colors but white would be the best choice so you can always see the ink colors & where you apply it.
Hope this was helpful.