Most bass drum pillows sit horizontally inside the shell. But not the DW Pro-Cushion. This hammerheaded muffling system gently damps both heads internally for a deeper, quicker tone — one that's fatter, more controlled, and ready for scrutiny under close mics. The DW Pro-Cushion is perfectly sized for bass drums 18" deep. Its hook-and-loop adhesive strips keep it from moving inside your bass drum, even in transit or when the music is really thumping.