Antiskid rubber: absorbing vibration and achieve higher quanlity of listening pleasure, improve sound clarity, stereo imaging and bass response Design: CNC Machined and spring isolation stand feet is easier to install, no need to make holes and no need to use double-sided adhesive to avoid damaging your equipment. Espeically it's convenient to adjust load bearing by moving or adding springs which can make sound feeling different Function: Using isolation stand feet is to suspend acoustic feedback from your speakers or sub-woofer isolation for vibration. The tones will be more focused, lighter and with less noise. It can also avoid much of the vibration that may disturb downstairs. Advantages: it has high attenuation characteristics which can keep low quantity sense and raise high frequency line feeling and simple sense. Applicable objects: speakers, amplifiers, instrument, turntable, CD/DVD players, recorders, and other equipments Material: Aluminum alloy colour: Black Package Contents: 4 x amplifier foot pad Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.