Model BPNMW4550CPB Nucleus Size 14x5.5 Shell material maple/walnut/maple Shell thickness 8 layers 8.1mm Bearing Edge SONIClear™ Bearing Edge (45° Batter side, 35° Snare side) Hardware Chrome Sonic Saver™ hoops Clamping lugs staggered 1/8" offset Drumheads Remo® Coated Ambassador, Remo® Clear Ambassador Snare Side Number Tension screws 10 Special feature air flow venting.