This is a petrified wood natural stone. It has not been polished. It has a solid, stable feel. I imagined the story of "Ancient Volcanic Peak," where a massive eruption long ago caused a large amount of lava to flow, creating folds like tree rings. Over time, the slopes were eroded by rain, wind, and snow, forming a cliffside rock peak. This petrified wood is from a Jindaigii cedar that was buried by a major eruption of Mount Chokai about 100,000 years ago. It flowed into a river over a long period of time and eventually came into human hands. Touching the rings, you can feel the passage of time. Size: Maximum height: approximately 11cm Width (in photo 1): approximately 12.2cm Depth: approximately 9.5cm Weight: 1698g Shipping will be via Rakuraku Mercari Bin or Yamato Transport Takkyubin 60 size. Thank you.