Bikoreshwa mubyuma bya fer, ibyuma bidafite fer, urupapuro rwa IC, gutwikira, ibyuma bya lamellar;Ikirahure, ceramic, agate, amabuye y'agaciro, urupapuro rwa plastike, nibindi.;Kwipimisha gukomera, nko kugerageza ubujyakuzimu na gradient ya karubone no gukomera.
