With the UFO Low Volume cymbals, you can practice drums almost without making a sound.
The many small holes in these cymbals reduces the mass so much, that it's almost only the attack and the decay you are left with. And it is absolutely perfect when you want a "silent" cymbal.
The UFO cymbals can of course be used for practice, instead of regular cymbals.
They can also be used instead of the included rubber pads on electric drum kits (Note: You will then lose the trigger capabilities).
The UFO cymbals are also very suitable for small practice setups consisting of practice plates.