Air-layering Propagation Kit - AirPropagator Small (2") & Medium (4") 2-pack of 2" AirPropagaror & 3-pack of 4" AirPropagator. Includes everything you need to propagate/clone plants. AirPropagator makes air-layering propagation easier, simpler & quicker. 2" AirPropagator is ideal for stem/branch " diameter or less. 4" AirPropagator is ideal for stem/branch " to 5/8" diameter.