The Kostal swim feeders are “cage” style feeders, they have been expressly developed to hold ground baits but can be filled with different baits and mix closed between two ground baits tops, like pellets, maggots, corn, etc. The main features of the Kostal swim feeders are their strongness and durability, thanks to this they’re nearly indestructible. The shape of the rectangular cage feeder is expressly developed for heavy flowing water fishing, thanks to their rectangular shape they’re less inclined to rolling than a rounded shape one, hence they’re developed for flowing water they works perfectly in still water, anyway their main feature is to hold firmly on the bottom.