Take your personal adjustment process one step further by choosing the insert. The single light blue flame unfolds at the push of a button in this new single burner insert. The single flame insert offers an odorless heat source that lasts longer than before and is stamped with the best-in-class guarantee. Zippo's new lighter insert collection, including this single flame option, is designed to fit perfectly with any standard Zippo lighter case. For optimal performance, you should add Zippo-Butane gas. Will be delivered in a gift box.