This item uses natural stones. The string is made of elastic rubber. Candy Jade (pink) approx. 8mm / Crystal approx. 8mm Inner diameter: approx. 50mm [Crystal] Crystal has a clear and pure shine. Since ancient times, it has been known as a "stone of purification" and is considered a versatile amulet, despite its simplicity. It harmonizes well with any stone and brings balance when combined with others. ◇ Due to the use of natural stones, there may be chips, scratches, and variations in color. We hope you enjoy these natural characteristics. ◇ Please refrain from purchasing if you are looking for the perfection of a mass-produced product, as this is a handmade item. ◇ The knots and ends of the string may not be completely hidden or may be left as part of the design. ◇ The color of the product may appear different from the actual item depending on your device and environment. Each stone has its own unique color and pattern, making it one of a kind in the world. We hope you enjoy these power stones casually, like a small amulet that accompanies you in your daily life. Please check the profile for bulk purchases.