This Flag set-up is very popular when attaching to the Ronstan Float. The flag is blue/white which is clearly visible for any boatman looking to spot you! The flag plays a crucial part in any spear-fisherman's code of safety. We urge all divers to use when spearfishing especially weed line or Harbour diving when the odd boat may venture too close.Ronstan set up is designed so if you already have a Ronstan float and want to add a flag system.