RIO Welding Tubing compliments the InTouch level “T” sinking material, allowing anglers and fly shops to customize the length of each sink tip by welding a loop in the end. The Level “T” Welding Tubing is a heat-shrink tubing that sits over a doubled-back fly line to allow for an easy welded loop to be performed. The Regular tubing has an internal diameter of 1/16th of an inch, while the Large tubing has an internal diameter of 3/32nds of an inch. Both tubes shrink to approximately 50% of their original size. 20 peices of six-inch tubing per pack.