"MAGIC" Thread makes sac tying easier and faster. Just three turns around the stem of the sac, pull tightly; three more turns and pull tightly an. That's all. No knotting required. Simple and effective. Also an excellent bait saver. Wrap around bait on hook or lures to hold bait on longer. (Shrimp, herring, sardine, salmon roe, crayfish, minnows, etc.) 100 feet of "Magic" thread per spool..