Mishimoto MMHOSE-CIV-88BK Honda Civic Silicone Radiator Hose Kit 1988-1991, Black Direct fit for 19881991 Honda Civic INNER DIAMETER: Hose 1-2: 1.02" Hose 3-5: 0.63" Hose 6-10: 0.31" OUTER DIAMETER: Hose 1-2: 1.4" Hose 3-6: 0.98" Hose 7-10: 0.53" High grade silicone and heat-resistant embedded fibers feature max temp of 330F Mishimoto Lifetime Warranty Interior Material: Heat-resistant embedded fibers Exterior Material: Silicone Maximum Temperature: 330 F Inner Diameter: Hose 1: 1.02", Hose 2: 1.02",Hose 3: .63", Hose 4: .63", Hose 5: .63", Hose 6: .31", Hose 7: .31", Hose 8: .31", Hose 9: .31", Hose 10: .31"