Thank you for viewing. This is a gua sha from Alqvimia, a Spanish natural cosmetics brand. The four different straight and curved lines fit perfectly into the angles of the face, allowing for a smoother massage. Purchasing from the homepage costs £45 (approximately 7300 yen) plus international shipping, which makes it even more expensive. If you are interested, please consider this. Also, you can search for "alqvimia gua-sha" on YouTube to find tutorial videos using this gua sha. There are holes and cracks in the stone, which are characteristic of Bian stone. These are inherent to the product and present from the beginning. Please refrain from purchasing if you are sensitive to this or if you are looking for a perfect product. (Please refer to the last photo.) Thank you.