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ARTENIUM Wooden Round Mandala Pebbles for Dot Mandala Dotting Painting, Large Size 70mm, Craft Rocks, Smooth Surface and Light Weight. Ideal for Rock Art. Set of 4 https://www.amazon.com/dp/B01B97JYEK/ref=cm_sw_r_cp_api_glt_fabc_RNCZPE6JTCHPEJE5K99E

10 Round Stones for Rock Painting – 2” inch Diameter Perfectly-Round 100% Natural Basalt Stone Canvases, Flat, Super Smooth, Non-Porous, Uniform in Shape and Size, for Mandala and Kindness Stones https://www.amazon.com/dp/B08Y8FR9V5/ref=cm_sw_r_cp_api_glt_fabc_N4GCDWE132QZ6PQY8DR2?_encoding=UTF8&psc=1

10 River Rocks for Painting, Flat & Smooth Stones, No Sharp Edges, 2" to 4" https://www.amazon.com/dp/B09JDGV3WT/ref=cm_sw_r_cp_api_glt_fabc_GN166ZEA4DPPGAJXV17S?_encoding=UTF8&psc=1