Made of high quality material, which is sturdy constructed, ensure high strength. Excellent corrosion resistance, abrasion resistance and shock resistance. Quick lock-open design, that you can change leaders or lures in seconds. Flexible rotation, not easy to wind around the fishing line. Small size would work great for freshwater like bass fishing. Use for soft , hard , head hook, sequins etc. Specification: Material: Brass Box Size: Approx.9.7x4.8x1.6cm / 3.8x1.9x0.6inch Color: Sliver 2#, 15Pcs, Diameter: 4mm; Length: 36mm/1.4inch; Tension: 30kg 4#, 20Pcs, Diameter: 3mm; Length: 29mm/1.1inch; Tension: 25kg 6#, 20Pcs, Diameter: 3mm; Length: 24mm/0.9inch; Tension: 18kg 8#, 20Pcs, Diameter: 2.8mm; Length: 22mm/0.9inch; Tension: 12kg 10#, 20Pcs, Diameter: 2.3mm; Length: 21mm/0.8inch; Tension: 12kg Package Includes: 1 Box Fishing Swivels with Snaps