Outdoor Muddy Mud Spare Key House Safe Hidden Hide Security Rock Stone Case Box Great for flower pots, rock gardens, front porches, or wherever you'd like to safely and secretly store a spare key. This plaster composite rock looks and feels real. Realistic looking rock that contains a secret compartment just right for hiding a key. Looks just like an ordinary rock but allows you to hide several keys inside it. You will never have to worry about being locked out again. Material:Synthetic resin. Size:9cm x 5.7cm x 4.5cm - 3.54inch x 2.24inch x 1.77inch.