Describe Shelf life:3 years 1. Made of extremely fine invisible material, it blends naturally with the hair, suitable for studio styling, daily hair buns and children's dance performances, creating a simple and fashionable look. 2. High elastic design, easily fits various head shapes, and is permanently fixed without loosening, providing a comfortable experience for people who need to wear it for a long time, such as nurses and dancers. 3. Multifunctional use, suitable for a variety of hairstyles such as ponytails and buns, whether in daily life or stage performances, can keep the hairstyle neat and beautiful. 4. Lightweight and breathable material reduces the sense of pressure on the head, making children and adults more comfortable during use, suitable for the whole family to share. 5. Exquisite and small, easy to carry, can be put into a cosmetic bag or handbag, quickly organize your hairstyle anytime, anywhere, to meet the needs of different occasions. Comment: 1. The manual measurement tolerance is 2-5g, please do not mind your replacement 2. Due to differences in different displays, the images may not reflect the actual color of the product. Thank you very much