Line keeper: A rubber compact keeper that can fix the line with one touch.convenient for holding the line thathas passed through the top guide when storing or moving the reel. Float type that floats even when dropped in water. Applicable line standard: Nylon/Fluoro (4 lb. to 30 lb.), PE (0.6 to 4).A convenient item for threading reels and micro guides.Supports guide inner diameter up to 2.5 mm