12 Strand Braid over 6mm Wire Core w/- Double Snap Lock 15'. For strength, durability and finish Yale's Wirecore Fliplines are unmatched. All Yale's wirecore fliplines are hand spliced using the superior Flemish Eye Technique, which maintains the full rated break strength of the wire and eliminates the high stress areas associated with crimps. The 12 strand polyester cover is held in place with a press fitting. Simple the best Wirecore Fliplines on the market.