Set of Rubber Magnetic Vise Jaws. Protection for your Projects Soft Jaws Stop wrapping duct tape around your vise, and protect delicate material the right way with this pair of hard-rubber, ribbed pads made to cover the jaws. The pads have (2) rare earth magnets embedded inside the rubber. Made for a 4" vise, they measure 4-1/2" long x 1-1/8" high x 3/8" thick with a lip along one long side. The rubber is 3/32" thick.