Fuel, primer, oil injection line & Carburetor vent lines BLACK: Motorcycle Type Thinwall, high quality, flexible BLACK: Reinforced hose is ideal for impulse lines that connect to fuel pumps BLUE: Top grade 100% polyurethane is not affected by subzero temperatures. Colored fuel line customizes your engine compartment. Visual confirmation of fuel flow PINK: Mikuni OEM quality vent lines keep fuel off your engine. Sold in pre-cut 11.5 lengths.