Create your own face mask to wear using these nested Rulers! Choice of nested set: Small + Large Set (Small = approx. 9” flattened finished size / Large = approx. 13” flattened finished size) -OR- Extra Small + Medium + Extra Large Set (Extra Small = approx. 81/4” flattened finished size / Medium = approx. 10” flattened finished size / Extra Large = approx. 111/2” flattened finished size)