Billfisher s Double Barrel Sleeves Fishing Accessory Black 1.3B Size 25-pack are some of the highest quality double sleeves. Less prone to crimping and fantastic for beginners these let you create clean joints without worrying that the leader will cross itself. These are black in color and are very durable. Conveniently packed in a vinyl bag with a flap you can reclose. The Billfisher Double Barrel Sleeves are brought to you by Sea Striker.