Hot ta'avale carbon uamea lapotopoto pa, e pei o le 15#, 20#, 35#, 45#, 50#, 55#, ma le 60#, o loo faaaogaina lautele i alamanuia eseese ona o latou meatotino sili masini ma versatility. O nei fuainumera e masani ona faʻatusalia ai le carbon content poʻo isi mea faʻapitoa o le sila, ma e masani ona fesoʻotaʻi ma togi uʻamea Saina.
O nei pa'u uamea lapotopoto vevela ua ta'avale ua lauiloa mo lo latou malosi maualuga, lelei machinability, ma weldability, faia latou talafeagai mo talosaga e pei o shafts, axles, gears, ma isi masini vaega. E masani ona faʻaaogaina i le fausiaina o vaega taʻavale, mea faʻatoʻaga, ma vaega faʻainisinia lautele.