Spro Power Swivels are made from stainless steel. They are extremely durable and hold up well in saltwater. Spro Power Swivels come 50 to a pack. Some people think swivels are swivels but not all swivels are created equally. Anglers have been fishing Spro Power Swivels with great success for a very long time and you should too. It's great that these are available in a bulk pack instead of having to buy and keep track of a lot of little packs of swivels. Upgrade your gear to Spro power Swivels!