Delicate Piano Tuning Key Wear-Resistant Tone Adjustment Comfortable Professional Piano Tuning Handle Fixed SetSpecifications:Definitely, the sound bars are used to mute external strings and can be tuned two octaves at a time. Sound silencer made of durable rubber to ensure long-lasting use. Soundproof hammer with wooden handle for ease and comfort during work. This kit is a must-have kit for pianists performing piano tuning work. With these tools, you can do your own piano repair work and learn some new skills in the process, as well as save money. Thanks to the use of metal, wood and felt materials, this tool set will be robust and resistant to wear and tear. This toolkit comes with a variety of tools and sizes to choose from. Suitable for fixing and repairing piano. Item Name: Piano Tuning KitsMaterial: FeltFeatures: Solid, Rust-proof, CompactSize Details:Sound Insulator: 20.5cm/8.07" (Approx.) Block Sound Insulator: 10cm x 1.3cm x 1cm/3.94" x 0.51" x 0.39" (Approx.) Tape Sound Insulator: 106cm x 2.5cm x 0.5cm/41.73" x 0.98" x 0.2" (Approx.) Sound Insulator Tape Thickness: 0.6cm x 0.6cm/0.24" x 0.24" (Approx.) Diameter of Felts: 2.2cm/0.87" (Approx.) Felts Thickness: 0.52cm/0.2" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be different