Pro Sportfisher Predator XL Classic Tube - Tie big flies on tubes! Tie pike and musky flies on tubes! Use these tubes with you favorite predator hooks. Totally tubular dudes! Use with the Pro Sportfisher Flexineedle XL Tube Fly Needle. These tubes will fit a Partridge Predator X hook in a 4/0 directly into the tube, and will take larger with a slight flare. 4.8mm outer diameter. These are the best predator tubes we've seen!