| 摘要 |
A trackball rotatably mounted in a hole of a cursor pointing device comprises a core layer of a first color having an engagement section including a plurality of engagement members on a surface; and an outer layer of a second color filled in a space between the engagement members; wherein a surface of the outer layer is flush with that of the core layer so that a plurality of speckles are formed on the engagement members and the trackball thus has two different colors.
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