For use with the iFish Pro Tip Up, the revolutionary ice fishing system that converts an ice rod to a tip-up. The iFish Pro Slip Stop is the floating connector that sets and releases the trigger mechanism on the flag. Simply thread it onto your line below the bobber stop and place the loop over the trigger. The iFish Pro Slip Stop features 2 different-diameter line holes to accommodate lighter and heavier lines. Hi-vis red color reduces the chance of loss. 5 pack.