TRI ASSOCIATES SP-22 TRI ASSOCIATES Insulator Unused. Thank you. [Specifications] Retail Price: 27,000 yen (for 3 boxes) Quantity: 6 pieces Size: Diameter (approx. 70mm) x Height (approx. 20mm) [Details/Features] Floating insulator using steel balls. It keeps speakers and audio equipment floating off the floor. It seems to be for 4-point support, but it's large, so I think it can be used for 3-point support as well. Please refer to the instruction manual in the images for details.