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It is the surface of the drum shell that actually touches the drum head.

The area of this surface is less than that of a cross-section of the whole shell, since it is created by making an angled cut into the shell around the rim.

The thickness or thinness of the bearing edge affects the tone of the drum; finer or sharper bearing edges yield a brighter tone, while thicker bearing edges yield a warmer tone.

If the bearing edge is not perfectly level and perpendicular to the cylinder of the shell, the drum head will not seat properly and the tone of the drum will suffer.

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15y ago

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