This piano tuning tool set is manufactured with wear-resistant and good material for durable and long-lasting use. It is designed for more easily muting the mediant and treble section. The clamp design makes them more convenient to use. Helpful tools for piano tuning repairing. Features -Color:White -Material:Nylon -Size:20.00X1.40X1.00cm/7.86X0.55X0.39in(Storage Holder) -Size:19.50X0.60cm/7.40X0.23in( fork) - The mute clamp is made of safe nylon material, and does not hurt the strings. - When using the retaining fork, close the fork and insert it into the gap between the right and middle strings of the harmonic string set under test, so that the front end of the fork can be squeezed in and fixed. This will stop the vibration of both the middle string and the right string. - The mute tool of piano is perfect to meet the tuning needs of the tuner. - When used, insert between the gaps that need strings to prevent the other strings from sounding the tuning. - Mute clamp is made of anti-wear and practical nylon material, which is durable for long-lasting use. Package list: 1 x Piano fork 1 x Case