We stitch our ITH Keyfobs on stiffened felt, marine vinyl, cork fabric, etc. You can find some of those products here:
Stiffened Felt (Affiliate Link): https://amzn.to/4miRhqz
Marine Vinyl: https://www.marinevinylfabric.com/products/9x12-marine-vinyl-scrap
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The highest price is $ 5.97