Njirimara arụmọrụ:
Ọ nwere nguzogide mmiri dị mma ma nwee ike idobe mmanụ nkịtị na mmiri na mmiri, ma nwee ezigbo nchekwa na ihu igwe.
Nwere magburu onwe shiee kwụsie ike.
Agbakwunye phosphor flake graphite nwere ike ibubata ọkọ iguzogide nke metal elu ma belata esemokwu ọnụọgụ.
Ngwa akụrụngwa:
Adabara mmanu nke elu-ibu na ala-ọsọ esemokwu akụkụ dị ka calender herringbone Kwadobe, ụgbọala spings, kreenu gia wiil, Ngwuputa igwe, winches na ígwè wires