Infinity swivels are made from the highest quality stainless steel to resist rust and salt water. Precision manufacturing allows for a thinner steel without affecting durability, which contributes to a smoother and lighter spool that still has great strength. By polishing all surfaces, wear on lines, rings and the bait is minimized and line twisting is counteracted by a silky smooth rotating mechanism inside the spool. - Better than ordinary ball bearing spools - Optimal for salmon trolling - Rotation without the slightest resistance