Sonor Essential Force Series 20"x17,5" Bass Drum, Color: Piano Black, Matched Bass Drum Hoops, the 6-ply 100% Birchwoodshells with 7,2mm thickness comes with a hefty and dynamic sound and with accentuated mid-ranges and highs, and defined lows, the hallmark of these shells, high-gloss-lacquered surfaces, Tuning Lugs with TuneSafe,