We found 2 dictionaries that define the word hard rubbers:

General (2 matching dictionaries)

1. hard rubbers: Merriam-Webster
2. hard rubbers: Collins English Dictionary

(Note: See hard_rubber as well.)

Definitions from Wiktionary (hard rubber) ▸ noun:  vulcanized rubber; ebonite ▸ Also see hard_rubber ▸ Words similar to hard rubbers ▸ Usage examples for hard rubbers ▸ Idioms related to hard rubbers ▸ Wikipedia articles (New!) ▸ Words that often appear near hard rubbers ▸ Rhymes of hard rubbers ▸ Invented words related to hard rubbers