Replaceable upper part:
Concave shoes shaped and with no bolt upper part will be provided. It can be used or not as occasion demands. Bolt-shaped can be purchased for good measure and it is replaceable.

Ceramic ball:
Each layer shows flexible moving with three zirconia.

A three level layer:
Three level layers with double controlling structure make natural attenuation of vibrations by preventing counter transference.

Stainless steel:
They add density of medium sound comparing to aluminum, weighing 2.5 times more than aluminum.

Center of gravity:
A gravity center that spike is placed, is has low center (it is even lower than 9mm).

Pyramid structure:
A Stable pyramid structure(not vertical shaped) makes maximum load lager and gives great stability.