NEW Smart Stop Micro is a revolutionary product designed to create a flawless slip bobber fishing experience without all the hassles. Made out of high quality plastic which faithfully mimics a perfectly tied bobber stop knot, Smart Stop Micros are fast to attach. Simply insert the line into the groove, snap shut with a pliers, and twist. Eight Smart Stops per spool. Designed to fit .004 to .012 diameter line. This is a REFILL pack for the Smart Stop Micro with Holder.