1. Stainless Steel: Made of high strength stainless steel, the fishing rolling barrel swivel has corrosion resistance and abrasion resistance, professional polishing to avoid damaging your fishing line.2. High Performance: This small swivel has a strong pull, sturdy structure and high strength. High speed rotation prevents twisting and entanglement of the fishing line.3. Double Rolling Barrel Swivel: Using double rolling barrel swivel can prevent fish line from tangling when the fish struggling, effectively reduce water resistance, and protect your fishing line from damage and difficult to untie.4. Package Including: A total of 4 sizes, 500 pieces of stainless steel fishing swivels are included, 100pcs in size 4, 100pcs in size 6, 100pcs in size 8, 100pcs in size 10, 100pcs in size 12, which can meet your needs.5. Easy Carry And Store: Comes with a small and durable plastic box with compartments. The fishing line connectors are neatly stored in the box, which are very convenient to place and take out.