■ Overview This is a bungee shock cord to be attached to the muzzle or line anchor of a speargun. *This product is used by connecting it to the shooting line. The multi-filament of the cord uses Spectra, the strongest line material ever, also found in Riffe's product lineup. "PE line" for fishing, which is highly durable and expensive, is also an abbreviation for polyethylene, but Spectra is a trademark of HONEY WELL and is a material of ultra-high molecular weight polyethylene, the same as Dyneema, and is called high-elastic polyethylene. Its features are that the original yarn is thick, making it resistant to abrasion, and it has low elongation, boasting 10 times the strength of iron and 1.4 times or more (by mass ratio) that of aramid fiber. Compared to Dyneema, Spectra is announced to be about twice as strong "as the minimum guaranteed value for the same thickness." ・ Spectra Line Diameter / 2mm It combines the strongest strength and lightness ever, and boasts high durability against chemicals, seawater, ultraviolet rays, and bending fatigue. In the "tensile strength test" to measure breaking strength, it measures 485 lb (*pound display). ・ Breaking Strength / 485 lb (*Converting US pound standard to kg is approximately 220 kg) The pigtail is an exquisite item made by attaching a brass ball bearing swivel from (有) Tokai to dead stock items where "Ono Kinzoku Kogyosho" used to manufacture corkscrews for fishing under the name of Onokin. Ready-made bungee shock cords also have "snap-type" pigtails with different shapes, but they are easily damaged when a load is applied with the line caught on the protruding part. Therefore, if the target fish is large, the pigtail is more durable, so you can rest assured when handling the catch in a tug-of-war situation. If the unit set on the digital scale shown in the YouTube video recording the durability test is lb (*pound), it can be seen that it breaks at less than 7 kg when converted to kg. *The URL of the YouTube video will be added in the comments section. ■ Size / Please refer to each image. ■ Neoprene Rubber Tube It uses products from a famous brand praised for its high quality, and the brand name is clearly printed on the actual product.