Atụmatụ:
* Njikọ dị n'etiti
* Nwere ike banye ujo, kwụọ ụgwọ radial, angular na axial deviation
* Mgbochi mmanụ nke mbụ na mkpuchi ọkụ
*Njirimara nke ntụgharị n'akụkụ elekere na n'aka elekere bụ otu ihe
* Otu nwere atọ dị iche iche hardness elastomer
* Otu esi edozi ihe ịghasa