Ibiro byoroheje byuzuza umubiri nubwoko bwuzuza umubiri bukunze gukoreshwa mubikorwa byimodoka kugirango wuzuze ubusembwa kumubiri wimodoka mbere yo gushushanya.Nibicuruzwa bibiri bigize ibice, bivuze ko bigizwe na resin hamwe nugukomera bigomba kuvangwa hamwe mbere yo kubisaba.Iyo bimaze kuvangwa, birakomera vuba kandi birashobora gushwanyaguzwa no gushirwaho kugirango bigerweho neza.Hariho ibicuruzwa bimwe bikurikirana kugirango uhuze ibyifuzo bitandukanye byabakiriya.