DIAMETER:2.0MM TO 8MM COMMON SIZE:2.5MM 3.0MM 3.2MM 3.5MM4.0MM4.5MM4.65MM4.7MM5.0MM6.0MM8.0MM , ANY SPECIAL SIZE CAN MAKE ALSO. These inner wires used for bus, truck, marine clutch cable use. THE RAW MATERIALS OF OUR PUSH INNER: OUTER: FLAT STAINLESS 304 WIRE. INSIDE: flexible type 1*19 , hard type 1+12 OR 1+9 INISIDE IS GALVANISED WIRE ROPE. MADE BY 70# STEEL.