If you have a desired inner circumference, please be sure to let us know before purchasing. It will cost an additional 50 yen for every 1 cm increase. Reducing the size is free. Inner circumference: Approximately 17cm (stretches) Matte Onyx 12mm Hematite 12mm Rondel *The number of stones varies depending on the size. 【Onyx】 Onyx, known as the "stone of protection," has been treasured as a talisman and amulet since ancient times. It is said to have a strong power to ward off evil and absorb negative emotions. Onyx takes on not only malice and envy from others, but also negative emotions within oneself. It also cultivates concentration and perseverance, strengthening willpower and judgment, making it suitable as a charm for important decisions in work and life, sports, and exams. 【Hematite】 Hematite is said to be the stone of Mars, the god of war. Mars is warlike, but he is also said to be brave and values justice, a god full of manliness. In that sense, it truly symbolizes the ideal man. It is said to strengthen the holder's mental strength, bring confidence and courage, and cultivate the power to realize desires. It is a power stone that can help when you want to do something but don't have the courage to act. It is also recommended for people in leadership positions in groups such as companies and schools. You will be able to lead those around you with strength and kindness. *Because they are natural stones, the color and pattern may vary even in the same stone. *The color may differ from the actual product depending on the lighting. In addition, it may contain cracks and inclusions unique to natural materials. Please understand this in advance.