Use "hard rubber" in a sentence

1. "Completely unbreakable - hard rubber!" he assured

2. The huge engine that powered the ship had the only sufficient heat source that would melt the hard rubber like material

3. These records were initially made of hard rubber and then eventually of a shellac-based compound and could play for about four minutes

4. Where the cylinder bolts to the hull, the holes were temporarily filled with imitation rivets of hard rubber

5. He looked around the basement and found a pair of thick gloves covered in hard rubber tossed into a plastic milk crate containing the mixings for epoxy resin

6. “No more, no more!” Quartermain grabbed the hard rubber wheels of his chair, causing them to stop short