[Product Type]:This product is a pack of 90Pieces Piano Tuning Tools,specifically Panxiang Spring,essential for maintaining the performance of your piano [Material]:These spring are made from metal,ensuring longevity and reliability in all types of pianos [Product Size]:Each Panxiang spring measures 24mm,making them suitable for most standard pianos [Package Contents]:Each package contains 90 pieces of Panxiang spring,providing ample supply for multiple tuning sessions or replacements [Versatile Use]:Ideal for professional piano tuner,music schools or individuals who prefer to maintain their own at home