| 1. | And years ago the school replaced hard rubber balls with softer ones.
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| 2. | Hard rubber has a content mixture dependent density around 1.1 to 1.2.
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| 3. | The handle seemed to jam, as though it was pushing against hard rubber.
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| 4. | The hard rubber ones, he said, were an extension of a player's skill.
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| 5. | The wheels can be air tires, hard rubber tires, or hard plastic tires.
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| 6. | It has spoke wheels, about seven inches in diameter, and hard rubber tires.
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| 7. | "I'd never had a bicycle that didn't have hard rubber tires before ."
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| 8. | These guns were shipped with hard rubber inserts for additional protection.
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| 9. | A hard rubber division must be placed between these primary coils.
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| 10. | The power block is a large powered aluminium pulley with a hard rubber-coated sheave.
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