Mishimoto Silicone Radiator Hose Kits are made with a dual layer combining high grade silicone and heat-resistant embedded fibers to provide efficient heat reduction and increased pressure tolerance, all with an OEM replacement fit! Interior Material: Heat-Resistant Embedded Fibers Exterior Material: Silicone Max Temperature: 330°F Inner Diameter Hose 1: 1.3" Hose 2: 1.3" Outer Diameter: Hose 1: 1.65" Hose 2: 1.65" Evo VIII (Black, Blue, Red and Orange) Evo IX (Black, Blue and Red)