How the sound quality of saxophone distinguishes saxophone is determined by his overall design (the size of the sound hole, the distance of the sound hole, the thickness of the blowing tube, the shape of the main tube) and the assembly (the seal of the mat, the height of the key cover). There are two factors that determine the quality of timbre. The timbre of saxophone depends on the material. Appearance procedures include: polishing, cleaning, painting, baking paint. Now some powerful manufacturers have made great improvements in appearance treatment, such as ultrasonic cleaning and electrophoretic painting. These are saxas that see what you buy.