6 Ply 100% Maple shell • 100% Maple shells give strength and richness of sound Extra deep shells with Sonic Cut • Maximizes resonance and increases focus and projection Rounded bearing edges • Eliminates unwanted overtones for superior clarity 2.3mm SuperHoop II • Increased strength and durability Redesigned aluminum alloy tension casings • With new sleek appearance and substantially reduced weight provides years of dependable service 8 tension casings on the 12" and 13" (instead of 6) • Improved tuning accuracy and even dispersion of tension 6mm case hardened tension bolts • Permits the highest tension without failure performance after performance 40mm tom spacers • Allows "close-in" positioning for improved playing ergonomics and better weight distribution • The best in the industry