Storing your shooting accessories has never been easier with the Magnetic Gun Cabinet Modular Storage System. This system expands the areas of storage on the inner walls or inside door of all metal gun cabinets. With GPS's Patent Pending System has Magnetic backing sewn directly into the back side of each modular storage item. They use very strong magnets called rare earth magnets. They are approximately 5 times stronger than standard magnets. Small Pistol and Clip Holster.