| 11. | Until recently, electronic drums were small solid pads made of hard rubber or plastic.
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| 12. | Stick to hard rubber and softer nylon type chew toys.
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| 13. | "They just don't make hard rubber anymore, " he said.
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| 14. | Ditto sheets of hard rubber more than an inch ( 2.5 centimeters ) thick.
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| 15. | Depending on the sulfur percentage hard rubber has a thermoplastic transition or softening temperature of.
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| 16. | When the war prevented import of eyeglass frames, demand for his hard rubber frames skyrocketed.
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| 17. | The hard rubber projectiles hit the chins and elbows of children playing at the party.
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| 18. | It was made of two parts and contained a hard rubber insert and brass reed.
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| 19. | In general, hard rubber bones and other latex dog toys help improve dogs'overall oral hygiene.
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| 20. | He has a handful of Chinese-made mitts and a bagfull of battered hard rubber balls.
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