Both ends of the swing swivels are make of high strength 7075 Aviation Aluminum, heavy duty, high strength, very enduring, wear resistant, resistant. Completely quiet, none noise, make your use more quiet and comfortable. The swing swivels is none friction and rotating 360 freely. Using sealed alloy steel ball bearings, the swing swivels is very compact and symmetrical at high speeds and prevents rope/chains kinking, hockling and twisting. If you like boxing, it can bring you the perfectly feeling of use; If you need to install a swing, hammock, tire swing, tree swing, hanging swing, disk swing, net swing, chair swing, 's hammock chair, swing swivels will make your family will have many fun. Package includes: 1pc Rotational Device