Tubeology Spate Salmon Tube Flies Pack 2 (31mm Tubes) Swappable Heads. Spate Water Collection includes Monkey Yellow (JC Feather Cheeks), Dunkeld, Comet, Green Highlander, Garry Dog, Silver Stoats Tail (JC Feather Cheeks). Interchangeable heads allow you to swap weight and hot spot colours or standard colours givingyou hundreds of variations from these flies.