Made by Suspension String Concepts in Germany, famous for their islotaion bases that use string suspension to absorbe vibration. The Ah! team in Holland tried alot of different feet to get the best sound, and these were it.
Look like normal feet? Hardly. They are filled with "pre-stressed" material working like multiple strings in a puck to absorb energy. Easy to screw in, takes about one minute. Clear midband and tighter bass.