These Bergerault Grand Professional Series Timpani are made with hand-hammered copper parabolic bowls in an array of different diameters. The one-piece copper bowls are manufactured using a spinning process exclusive to Bergerault. The bearing edge and pedal mechanism are meticulously crafted to achieve outstanding tuning stability and pitch accuracy. This combination of premium components and artisan construction produces Timpani with superb sustain, projection and tone.