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. There are two sizes of tubing available, "Regular" and "Large". The Regular tubing has an internal diameter of 1/16th of an inch and is great for T11 and smaller, while the Large tubing has an internal diameter of 3/32nds of an inch, and best for T14 and larger. Both tubes shrink to approximately 50% of their original size. Both sizes of tube are available in two quantities:The "Pack" has 20 pieces of 6" tubing, while the "Bulk" pack contains a 50 ft coil of tubing.To watch a video on how to weld a loop in the end of the line, go to: https://vimeo.com/117008675