Materials: with high hardness and density has low harmonic vibration and high damping; Antiskid rubber: absorbing vibration and achieve higher quanlity of listening pleasure, sound , stereo imaging and responseDesign: Machined and isolation stand feet is easier to install, no need to make holes and no need to double-sided adhesive to avoid damaging your equipment. Espeically it's convenient for you to adjust load bearing by moving or adding springs which can make sound differentFunction: 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 may disturb downstairs.Advantages: it has high attenuation characteristics which can keep low sense and raise high frequency line and simple sense. Applicable objects: speakers, amplifiers, instrument, turntable, CD/DVD players, recorders, DAC and other equipmentsDiameter:43mm and 50mmHight:38.5mmThe weight load capacity of each is 7.5KGItem Type: Hybrid ConnectorsGender: Malecolor:BlackMaterial:aluminum alloyPackage Contents:4 x Speaker Isolation StandOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.