It’s a walnut basswood tray I got off Amazon, which is meant for wood burning. I then stained the wood after.
Here’s the link if you’d like:
Walnut Hollow 1829 Basswood Vintage Plaque for Woodburning, Painting and Chip Carving, 9 x 13 x 0.75, Wood https://www.amazon.com/dp/B000XZWBQ8/ref=cm_sw_r_cp_api_glt_fabc_197KFA6WRTQ6ZV06FT9Z?_encoding=UTF8&psc=1