Example of Use

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Ball Bearing
The most popular use of the balls. It is used for various revolving places such as automobiles and bicycles. Not only iron balls but also ceramic and plastic balls are used for the bearing too. (steel ball, plastic balls, ceramic balls).
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Thrust Bearing
Used for the thrust bearing which is used to rotate heavy items. Not only iron balls but also ceramic and plastic balls are used for the bearing too. (steel ball, plastic balls, ceramic balls).
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Caster
Used for moving heavy item from one place to other. Not only iron balls but also ceramic and plastic balls are used for the bearing too. (steel ball, plastic balls, ceramic balls).
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Roll-on Container
Used for the roll-on container for applying medicine and perfume. It basically uses the same mechanism as the tip of the ballpoint pen (plastic balls).
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Level Gauge
Used for the level gauge of the tank for liquids such as oil, water.. (plastic balls).
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Valve
Used in various places of the liquid/gas piping as a part of safety valves and non-return valves. The ball is used inside these valves (non-metal balls, plastic balls).
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For Shaking
Various balls are used for shaking/mixing the contents such as spray cans (stainless balls, soda glass balls).
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Ballpoint Pen
A tiny ball is used for the tip of ballpoint pens (steel balls, super-hard balls).
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Track ball, Mouse
For tack ball and ball for the mouse (plastic balls, rubber balls, urethane balls).
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Weight
Weight for the stuffed dolls (Teddy bear) and toy boat (steel balls, stainless balls, coated steel balls).
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Pachinko and Games
For Pachinko (steel balls) and game machine (steel balls, plastic balls).
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Joint of the optic fiber
Ball lens is used for the joint of the optic fiber cables (optical glass balls, polycarbonate balls).
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Concentration of Light
For the concentration of light, glass and plastic ball lenses are used (optical glass balls, polycarbonate balls).
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Aspheric Lens
For the blank of aspheric lens, optical glass ball is used (optical glass balls, polycarbonate balls).