Radiator hose and heater hose is chrome plated stainless steel with polished aluminum ends. Flex hose kits includes stainless steel hose two polished aluminum ends, rubber connecting hose, rubber reducers, and stainless steel hose clamps. Radiator hose is 1-3/4” O.D. and is available in 12”, 24”, and 36”. Heater hose kit is 3/4” O.D. and is available in 48” kit only.