This item uses natural stones. The string is made of elastic rubber and is stretchy. Crystal: Approximately 8mm / Cracked Crystal: Approximately 8mm Inner Diameter: Approximately 65mm 【Crystal】 Crystal has a transparent and clear shine. It has been known as a "stone of purification" since ancient times and is considered a versatile amulet, despite its simplicity. It goes well with any stone and harmonizes the whole when combined. 【Cracked Crystal】 Cracked crystal sparkles by reflecting light with its crack-like pattern. It is also said to be a stone that brightens the holder's mood. The sparkle changes depending on the angle of the light, giving it a different appearance every time it moves. ◇ Because natural stones are used, there may be chips, scratches, and differences in color. We hope you enjoy these characteristics. ◇ Please refrain from purchasing if you are looking for the perfection of a mass-produced product, as this is a handmade item. ◇ 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 stays close to your daily life. Please check the profile for bulk purchases.