Bikwiranye nicyuma cya fer, ibyuma bidafite fer, flake ya IC, ibifuniko, ibyuma byanduye;ikirahure, ububumbyi, onyx, amabuye y'agaciro, flake ya plastike, nibindi.;kugerageza ubukana, urugero kubwimbitse na gradient ya karubone kandi yazimye ibice bikomeye.