Plastic Nobsound? Says Ecstasy Prop

The pictures look like acrylic and corian, something like that. The only purpose it serves is to hold the springs spaced in alignment. The actual material is rather unimportant, and certainly does not need to be very strong. I made some out of MDF to use the extra springs, they work just fine, virtually the same as the aluminum. Maybe you should actually try them before writing them off? 

The description on Amazon says aluminum alloy.

There's different versions. Aluminum about $30, acrylic $22, and I've seen others. The springs all seem to be the same they just change the footers. Mostly you want the springs, because unless you component is really heavy you only need 3-4 springs and can use the extra 3-4 to make new sets. All it takes is a piece of wood and a 1/4" drill bit. Makes this the bargain tweak of the century.

I bought 3 sets of their springs and one box showed up with only 3 springs in it.  Amazing quality control.  You get what you pay for.  Almost.

I bought them from Aliexpress...Nobsound-like...

No problem...

4 sets of four boxes....

I used them one set for each speakers...With the 7 springs...

Four boxes under my speakers (20 pounds)

Four other boxes on top of the speakers with on top of them around 80 pounds of concrete

Under all speaker i use a sandwiche of different materials( quartz-granite-sorbothane-cork-bamboo) to isolate in better way each speakers from all the gear on my desk...

The load which damp each speaker is finely tuned UNDER 1% of precision (or near100gram of variation) by EARS to damp each speaker positively...

The difference in asymmetric compression between the 4 boxes under the speaker and the 4 boxes on top of the speakers, with a difference of 20 pouds in compression help decrease resonance effects...The magic is all there compared to 4 boxes only under the speaker without damping load and without a supplementary 4 boxes under the load...

It is relative isolation of vibrations with fine tuned dyssemetrical compressive force applied for resonance control...

Cost nothing...

Almost nothing, compared to anything which will be  supposedly "better" but not by a so great margin .... This compare to anything using springs....

Using the way i use it, it is optimal with this type of springs....

Better exist, but my ratio S.Q./ price is my rule.....