Feem ntau ntawm cov khoom siv hlau thiab cov khoom siv cable yog cov khoom lag luam uas muaj tib seem (cross-section) cov duab (tsis quav ntsej txog kev ua yuam kev los ntawm kev tsim khoom) thiab cov hlua ntev, vim tias lawv siv los ua cov kab lossis coils hauv tshuab lossis khoom siv. txiav txim siab. Yog li ntawd, txhawm rau kawm thiab txheeb xyuas cov qauv tsim ntawm cov khoom siv cable, nws tsuas yog yuav tsum tau soj ntsuam thiab txheeb xyuas los ntawm nws cov ntu ntu.
Cov txheej txheem ntawm cov khoom siv hlau thiab cable feem ntau tuaj yeem muab faib ua plaub yam qauv tseem ceeb: cov khoom siv hluav taws xob, cov txheej txheem insulating, tiv thaiv thiab sheathing, nrog rau cov khoom ntim thiab cov khoom tensile. Raws li kev siv thiab kev siv ntawm cov khoom, qee cov khoom muaj cov qauv yooj yim heev.