Easy Catch &reg; 100% Stainless Steel American Fishing Mighty Mini Rolling Swivels 1)100% stainless steel 2)50pcs or 100pcs pack. 3)Size: 10mm or 12mm. 4)The Vision Rolling Barrel Swivel was specifically designed to provide less line twist, unrestricted movement and less rotation drag. 5)A smooth nickel black finish compliments this great swivel.