Spring for automatic trunk opening. Good thing - when you come from the store with packages, or the trunk lid is dirty and you would rather not get your hands dirty. This spring is installed on cars with trunk lid without shock absorbers. The spring is 5.5 inches long when compressed, 9.5 inches when stretched, and 0.8 inches in diameter. The material of construction of the spring is stainless steel. The spring is stiff, but some cars may need two pieces, for symmetrical arrangement. The seller ships springs in different colors.