Hlau, welded, hlau plhaub, thiab cov qauv cam khwb cia yog sau nrog kev co-txo epoxy resin-bonded ntxhia casting.
Qhov no tsim cov qauv sib xyaw nrog kev ruaj ntseg mus sij hawm ntev uas tseem muaj cov qib zoo li qub thiab dynamic rigidity.
Kuj tseem muaj nrog cov khoom siv hluav taws xob-absorbing filling