KastKing World's Premier Copolymer Fishing Line Great Upgrade For Monofilament Fishing Line Substitute For Fluorocarbon Fishing Line KastKing Copolymer fishing line has less stretch than monofilament fishing line but more than braided KastKing Copolymer fishing line has much higher abrasion resistance than monofilament line KastKing Copolymer line has less memory than mono line, easier handling and smoother, longer casts Compared to mono fishing line copolymer has terrific knot strength, low visibility, slow sink rate If using fishing line monofilament isnt your only choice for your fishing line spooler