RECOMMENDED FOR: Pan Fish, Walleye, Bass, Catfish, Steelhead, Northern Pike. Many times fishermen discard the typical non-slotted bobberstop sleeve the wrong way only to have to start their rigging process all over. With Rod-N-Bobb's new slotted sleeves this can never happen because the sleeve is slotted! Another advantage is the sleeve can stay on the line until the entire slip-rig is assembled, a great advantage especially when trying to assemble during windy conditions.