Raceworks Silicone Hose is hand made and contains 5mm walls constructed from 4-ply reinforced silicone polyester, offering burst pressures of up to 348psi (see application table for individual ratings) and a temperature range of -40 to +180 degrees Celsius. All hoses are UV, ozone and electrochemically resistant to avoid fading and separation. NOTE: Silicone hose is not fuel safe.