Zippo's yellow flame butane insert is the perfect accessory for any classic Zippo lighter case. The refillable butane insert stays true to Zippo's roots in form and function and produces an odorless yellow flame for even more versatility. Backed by our best-in-class warranty for years of reliable use. For optimum performance, fill with Zippo butane fuel. Comes packaged in a gift box. Made in China.