This Bergerault Grand Professional Series Timpani is made with hand-hammered copper. With a parabolic bowl, it's available 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.