Description: rotation, not easy to wind around fishing line, with high tensile strength. Excellent corrosion resistance, abrasion resistance and shock resistance. Quick lock-open design, change leaders or lures in seconds. Particularly using for lure fishing, applicable to soft bait, hard bait, hook, etc. Ideal for various rigs and leader trace making, high performance in Bass fishing, freshwater, saltwater, offshore fishing. Specification: Material: Copper Size: As Below 12# Length: approx. 0.79 cm/0.31 inch, Weight approx. 0.05 g 5# Length: approx. 1.41 cm/0.55 inch, Weight approx.0.28 g 2# Length: approx. 1.81 cm/0.71 inch, Weight approx.0.50 g 8# Length: approx. 1.1 cm/0.43 inch, Weight approx.0.11 g 4# Length: approx. 1.51 cm/0.59 inch, Weight approx.0.32 g 6# Length: approx. 1.36 cm/0.54 inch, Weight approx.0.19 g 3# Length: approx. 1.77 cm/0.70 inch, Weight approx.0.28 g 10# Length: approx. 0.9 cm/0.35 inch, Weight approx.0.39 g 7# Length: approx. 1.18 cm/0.46 inch, Weight approx.0.12 g Package Includes: 100 Pieces Fishing Rolling Swivel(4 Pack)