Isolates turntable from acoustic feedback and seismic vibration from footfall etc. replacement turntable feet with spring and damper isolation solution adjustable spring rate by adding or subtracting springs copes with a range of turntable weights, ensures that the resonant frequency is below the listening range damping can be added to reduce motion compensate for unlevel surfaces by screwing each foot in or out to your liking comes w/ (4) feet , fits Technics sl1200 turntables imported from the UK