This item uses natural stones. The string is made of elastic rubber. Rose Quartz: Approximately 6mm / Crackle Quartz: Approximately 8mm Inner circumference: Approximately 17cm 【Rose Quartz】 Rose quartz has a gentle pink color. It is sometimes called the "stone of love," but more than that, it is said to soften the heart and remind you of the importance of self-love. Its gentle color will gently accompany you in your daily life. 【Crackle Quartz】 Crackle quartz sparkles by reflecting light with its crack-like patterns. It is also said to be a stone that brightens the wearer's mood. The sparkle changes depending on the angle of the light, giving it a different appearance every time it moves. ◇ Due to the use of natural stones, there may be chips, scratches, and variations in color. We hope you will enjoy these characteristics as well. ◇ As this is a handmade item, please refrain from purchasing if you are looking for the perfection of a mass-produced product. ◇ There may be cases where the knots or ends of the string are not tucked away, or are left as part of the design. ◇ The color of the product may appear different from the actual product depending on your device or environment. The color and pattern, the individuality of each stone is unique in the world. We hope you will enjoy power stones casually, like a small amulet that accompanies you in your daily life. Please check the profile for bulk purchases.