I found these at a beach near my home (^^) It's a set of 11 pieces of driftwood! The first photo shows everything. I haven't removed the tannins, but I have: Washed with water and a brush → dried in the sun → brushed. ⚪︎ Although I have cleaned them, there may be some dirt, sand, or mold that hasn't been completely removed. ⚪︎ If you plan to use them for living organisms, please clean them and remove the tannins before use. ⚪︎ They will be packed in a box as is. ⚪︎ There may be breaks, chips, or peeling of the surface during transport. Instant purchase is OK!