Size: 4 sizes ( 3.2mm 4 beads,4.5mm 3 beads,4.5mm 4 beads,4.5mm 6 beads) Material: stainless steel,good corrosion resistence Freely Spin: 360 degree high speed rotation. Fast and smooth rotation without entangle the line. Wide Applications: This swivel is perfect for salmon or steelhead fishing or for any other type of fishing you do where you troll bait or plugs. This is the preferred ball chain swivel if you are trolling with a diver, dropper weight, connected to a flasher, connected to a 3-6 foot leader pulling bait or plug. These ball chain swivels eliminate all twisting of the line MOQ:20PCS