Size: 12.5 * 4.6 * 1 (cm) Hair massage stress relief. It's perfect as a gift for friends! Because it is a natural wood, static electricity is less likely to occur, reducing damage to hair. [One year warranty] This product comes with a manufacturer's 12-month warranty. At first it is yellowish brown, but when it is used, it becomes dark and changes to a greenish color. Due to exposure to sunlight and air, it eventually becomes fresh green. Gives hair a natural scent.