Zirconium core, inoshandiswa kune tundish nozzle.
Hunhu hunokosha:
1. Kuramba kwakanaka kwekuora, hapana kuwedzera kwedhayamita kuri pachena, hupenyu hurefu hwebasa, hapana kutenderera kuyerera, chiitiko chekupararira;
2. Thermal shock performance yakanaka, anti-kuputika kuita kwakanakisa;