Silicone Fuel Tubing for RC Nitro Glow Engines. 1M Long, 2.3mm Internal Diameter\nSupplied by the metre, but is cut from a roll, so if you order 3M it will come as a 3M length etc.\nColour may vary, sometimes is transparent, transparent blue or transparent red.Fuel can always be seen regardless of colour. If you have a preference please leave a note on your order and we will try our best to accommodate.