For toms, a disc placed on the skin neoprene, for the bass drum, a foam plate with a square neoprene to receive the bat, all attached to the circle by 2 rods.
I am very pleasantly surprised by the feel and the rebound: you can work quite normally. Finally, we can enter without restraint on his toms. The sound of the bass drum is perfect, and the rebound of the bat is even better than on the skin.
The attenuation of the sound volume is very good, but I do not think we can play at night in an apartment for example (it depends on your sound and your neighbors of course !^^). Of course the sound is awful, especially the cymbals ... Still means the agreement of the toms and the sound of the snare, but to work.
I recommend this solution to work silently, without the electronics (more expensive and ... electronic!). I regret not having made that choice earlier.