Sweetluxe car fresheners are completely handmade. The small boxes are approximately 2 in. x 4 in. These boxes are filled with scented beads and have a mesh-like screen on both sides for the fragrance to be released in your car. These work best when it's warm and struggle to put out fragrance in really cold climates. To refill them, hold the container over a trash can and carefully slide the lid off. It does have a locking mechanism so there will be a little resistance. Once refilled, close the lid until it locks (clicks) shut.