Measures 5mm outer diameter by 2mm inner diameter. This fuel line is uncut we will cut it into 1 meter lengths before dispatch however if you prefer 2 meters (or longer) please purchase a quantity of 2 (or number of meters required) from the same listing. Note: Suitable for nitro glow engines only not suitable for petrol engines. Note: Picture for illustration only - 1 meter per 1 quantity.