| 摘要 |
PURPOSE: An O-ring is provided to enable a user to easily check the abrasion and deformation of the O-ring by having various color sections. CONSTITUTION: An O-ring(3) is made of rubber, and has two or three color sections. The color sections have the identical thickness, thereby enabling a user to easily check the abrasion and deformation of the O-ring according to the change of color.
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