Each magnet holds up to 15 lbs. Rubber coated so it won't harm the finish of your gun. Uses 2 small wood screws to mount for home application. You can mount them underneath a desk, in a closet, next to the bed or even in your gun safe. For car application each magnet has a piece of 3M VHB (very high bond) tape that can be used to mount the magnet in your car without having to use screws. The 3M VHB tape is good up to 218 degrees F so even in the heat of summer it won't fall off. Magnets are available in a 2 pack for $40 or a 4 pack for $60