Brand new, unused, and the stones are unopened. "Magic Stone Set" A set featuring a 2.7cm thick, extra-thick lava stone for low-temperature cooking with far-infrared rays, and an OLDMOUNTAIN original patterned wooden underlay. With a thickness of 2.7cm, the low temperature allows the heat to penetrate thoroughly, resulting in incredibly tender and delicious cooking, truly a magic stone. Meat cooked with far-infrared rays will be crispy on the outside and juicy and tender on the inside. The wooden underlay can also be used to place the heated lava stone, allowing you to cook at the table like a steakhouse. (The wooden underlay will become charred and black.) When flipped over, it can be used as a cutting board, and without the stone, it can be used as a wooden plate. *Both are natural materials. Placing the stone on the cutting board when it is extremely hot may cause it to catch fire. Also, sudden temperature changes (heating quickly over medium heat or higher, or immersing in water while hot) and maintaining high temperatures (leaving on high heat for a long time) may cause cracking or a decrease in strength, so please read the included instruction manual carefully. Depending on the wood used, the grain may appear black, but this is not a defect; please enjoy it as a unique characteristic. *Usage Precautions* When heating the lava stone, keep a safe distance from the gas pipe, as it can be dangerous. Please use a heat shield or cover the gas pipe.