I have magnetic multi-purpose jack pads. One side is magnetic and the other side has a slit. I use the magnetic side to quickly and precisely attach the pad onto the car/engine frame. The slit side is used for the seam-weld jackpoint, is not magnetic, but it secures it to the jack.
I even use them as magnetic trays to hold nuts, bolts, etc. when working on the car. To store them, I attach them to the jack --- this made me not lose my pads as often.
