Kawaii Piano Insulator - Set of 4 for Upright Pianos

I purchased these about 10 years ago on the recommendation of a Kawai piano tuner. I believe they cost around 20,000 yen.
Each one weighs approximately 860g.
I no longer need them as I have sold my piano.
The rubber in the center has peeled due to age.

Maximum diameter is about 14.5 cm.
Minimum diameter is about 5 cm.

These are soundproofing insulators for upright pianos.
They prevent impact noise and vibrations.
They have a two-layer structure of natural rubber and a metal cup, which directly cuts off vibrations.

■ Features
The unique structure and material (special natural rubber) absorb the vibrational energy generated during piano playing.
Piano sound travels downwards through the casters along with vibrations. To prevent sound leakage to the floor below, they offer excellent soundproofing effects.

■ For upright pianos, set of 4
Quality: Special rubber
Color: Black

They will be shipped in a box.

There are no issues with use, but there are many signs of age-related deterioration and dirt.
Please purchase only if you are not concerned about these imperfections.