2 1/2" Clear bobber is used for casting long range. Bobber can be filled with water adding up to three ounces to aid long casts. I like to use these bobbers for casting a bonito fly or for fishing over rocky reefs. Fill then with colored water and you can see them at distance.
For fishing the bonito feather slide the bobber up your main line and attach a swivel. Tie one end of the 36" 12lb fluorocarbon leader to the swivel and the other end to your fly. Cast as long as possible, reel up slack, slash bobber to splash, reel, repeat.
For fishing over rock and reef areas attach bobber to main line in place of the sliding sinker (as with a Carolina Rig) and above the leadered swivel. Cast out and allow line to sink to the bottom.