Auralex Acoustics HoverDeck HD-64 Gig, rugged MDF laminate core & web-like ISO-Puck modular risers minimize structure-borne sound transmission and sympathetic vibrations between drums and hardware, contains 6 pcs HD-22 Panel (60 x 60 x 2,5cm) and 1 pcs HD-tc Panel (60 x 80 x 2,5cm)