These are used to mute one or more piano strings during piano tuning. Highly durable and long lasting. Set of 7. 2 rubber mutes with wire handles, 3 Medium Wedge Mutes measuring 3-inches Length X 3/4-inches Width, and 2 Large Wedge Mutes measuring 6-inches Length X 1/2-inch Width. Handles and rubber wedges require assembly.