Auralex Platfoam x1
When used as riser support, PlatFoam Isolation Foam GREATLY purifies the tone of whatever's on the riser and yields dramatically improved isolation characteristics, thus minimizing sound transmission to neighboring spaces. This is a fast, portable, easy and affordable solution to many of your sound isolation problems!
Dimensions: 2" x 4" x 4' piece of high-density foam
See Additional Picture for Application Ideas.
"The main benefit of the PlatFoam HoverDeck is that it makes my drums sound better I immediately heard a big difference My drums had more definition, more punch and a fatter, clearer low end!" Kenny Aronoff - Drummer