1、Aluminum Alloy Material: The speaker cone base pads use 7075 aviation all aluminum alloy, it has high hardness and high density, low harmonic vibration point and high damping. 2、Anti Slip Rubber: Absorb vibration, get higher quality listening pleasure, improve sound clarity, stereo imaging and bass response design. The rubber shock absorption round ring is directly embedded. 3、Easy To Install: No need to punch holes, no need to use double sided tape; It can be installed from the inside of the case, or it can be installed from the outside of the case with self tapping screws. (with 4 screws) 4、Function: To suspend the acoustic feedback from the speaker or subwoofer to isolate vibration. More concentrated, lighter, and less noisy sound. Also avoid most vibrations that would destroy the bottom layer. 5、Scope Of Application: For DACs, speakers, amplifiers, meters, turntables, CD/DVD players, recorders, and other equipment. CNC machining, make your voice feel different by moving or adding springs. Item Type: Speaker Isolation Spike Stand Foot Material: Aluminum Alloy Model: SP4010 Quantity: 4pcs Diameter: Approx. 40mm / 1.57in Height: Approx. 20mm / 0.78in Installation Aperture: Approx. 4.5mm / 0.18in Scope Of Application: For DACs, Speakers, Amplifiers, Meters, Turntables, CD/DVD Players, Recorders, and Other Equipment 4 x Speaker Isolation Spike Stand Foot 4 x Screw