This is the Dyneema rope I chose for my spear. It is used on my spear. #anzyproduct's list of 2mm diameter Dyneema ↑Click to see my Dyneema listings The line on a float will create resistance when the spear hits the fish. Therefore, a softer line is more advantageous for floats. This line is very soft, minimizing resistance when spearing fish. Domestic stainless steel wire is about 1.5mm thick and has a load capacity of about 50kg. It is reasonably strong, but the wire is hard, so the part that comes out to the side of the float creates resistance when penetrating the fish, which is disadvantageous when shooting at hard-scaled sea bream or at the edge of the range. Also, because the line itself is soft, it is less likely to tear the flesh. ＜Features of Dyneema＞ Compared to other materials, it has excellent abrasion resistance, impact resistance, and weather resistance. Weather resistance refers to the alteration of materials due to sunlight, ultraviolet rays, temperature changes, water, and oxygen, such as deformation, discoloration, and deterioration. Specifically, it means "discoloration, hardening, and loss of strength." Dyneema has high weather resistance and is ideal for use underwater and in the sea, so it is also used for fishing lines, nets, and marine ropes. Dyneema also has excellent flex fatigue resistance. Wire tends to get bent and the same parts bend repeatedly, causing a decrease in strength, whereas Dyneema is very soft and the damage from bending is extremely small. You can easily prevent fraying by burning the end of the rope with a lighter. The titanium float in the photo is not included. Line only.