1、INCLUDED TOOLS: Piano tuning tool kit, including a wool felt temperament strip, 2 tuning sticks, and 2 tuning blocks, convenient and practical. 2、MAIN FUNCTION: Mainly used to accurately adjust the pitch of the piano, twelvetone equal temperament, to achieve better sound effects. 3、RUBBER MUTES: These guitar tuning mute blocks are made of excellent rubber, with good elasticity, wear resistance, and impact resistance. 4、WOOL FELT STRIP: The tuning strip is made of wool felt, lightweight and elastic, providing good protection and not damaging the instrument. 5、APPLICATIONS: Ideal piano tuning tool for apprentice, teacher, trainer, professional piano tuner or anyone who wants to learn piano tuning.