Material: stainless steel, wood Color: Multicolor Quantity: 8 pieces Package content: 1*wrench, 1*tuning bar, 6*mute 1. Piano Tuning Wrench: L-shaped design, made from hard stainless steel and wood handle, durable & abrasion-resistant, easy to use and portable to carry with you. 2. Temperament Strip: Temperament Strip made of felt materials, applied to mute two octaves at once by pushing between the groups of strings with a screwdriver or flattened hammer shank, this is the most efficient way of setting a temperament in, save you a lot of time. 3. Rubber Mutes Kit: 2 rubber mutes with handle and 4 rubber mutes, made of durable and natural rubber and correctly tapered, helps you to mute the section more simply. 4. Multi-purpose: Ideal piano tuning kit for apprentices, students, teachers, trainers, professional piano tuners, or anyone who wants to learn piano tuning.