Atlas-Mike's Magic Thread "Magic" Thread makes sac tying as easy as pie! Just three turns around the stem of the sac, pull tightly; three more turns and pull tightly again. That's all! How easy is that? Absolutely NO knotting is required. Also an excellent bait saver... wrap around bait on hook or lures to hold bait on longer. Makes sac tying simple Use with herring, sardine, salmon, roe, crayfish and minnows Comes in 100 ft. spools.