4 oz. 4 oz. are packed 1 trolling sinker per pack Ball Bearing Snap Swivel Clarkspoon ball-bearing troll sinkers virtually eliminate line twist when trolling Clarkspoons. Made with nickel-black ball bearing snap swivels. Available in 1 oz. to 4 oz. sizes. To use, tie the sinker to the line from the rod (using a snap/snap swivel here makes it easier to change). Connect Clarkspoon, Mackerel Tree Rig, or Mackerel Duster Rig using a 10-15 foot leader to the other end.