Piano Tuning Wrench: L-shaped design, handle, durable&abrasion-resistance , easy to use and portable to carry with you. Rubber Mutes Kit : made of durable and natural rubber and correctly tapered, helps you to mute the section more simply. Extended Temperament Strip: Extended length up to 110cm, made of felt materials, applied to mute two octaves at once by pushing between the groups of strings with a screwdriver or flattened hammer , this is the most efficient way of setting a temperament in, a lot of time. Totally include: 1 pcs Tuning Hammer, 1 pcs Temperament Strip, 2 pcs Rubber Mutes, 2 pcs Rubber Mutes with handlef. perfect piano tuning kit for apprentices, students, teachers, trainers, professional piano tuners, or anyone who wants to learn piano tuning. Material: Wood+metal+rubber+wool felt colour: As shown Package Contents: 2 x Long Mutes 2 x Short Mute with Handle 1 x Temperament Strip 1 x Tuning Hammer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.