Made of stretchable vinyl.
Helps prevent dirt or water from entering into the engine.
One Large Dust Cap (3/4" (17mm) inside diameter)
One Medium Dust Cap (11/16" (16mm) inside diameter)
One Small Dust Cap (1/8" (3mm) inside diameter)
The Two Larger ones are used for the Carb and the Exhaust port.
The smaller one is used for the fuel intake nipple.