This Spool Includes 50 Feet of Medium Super Blue Silicone Tubing from Du-Bro. FEATURES For Glo-Fuel only. Won't crack or harden. Fits securely on fuel fitting. This is a good size for .10 thru .60 size engines. Wound on a plastic spool. INCLUDES 50 Feet of Medium Super Blue Silicone Tubing REQUIREMENTS Fuel Fitting Glo-Fuel SPECIFICATIONS Inner Diameter: 3/32 (2.3mm) Length: 50'