When shaping the bell, the process of cooling must also be carefully controlled, so that the metal does not become brittle and crack. After two or three hours of hammering, as the brass becomes tempered, the metal's sound reflection properties improve, which increases the resonance of the instrument.
吹頭敲打過程中，還必須經過火燒「退火」處理，讓銅片不會脆硬破裂，經過兩、三個鐘頭的敲打，銅的密度增強，反射頻率越好，薩克斯風的共鳴也就更高。