The Zippo Yellow Flame Butane Insert is a genuine Zippo insert producing an odorless yellow flame. It uses wheel-and-button ignition with a replaceable flint, is refillable with butane and has a 0.9 g fuel capacity. One fill provides up to 125 five-second ignitions. It fits classic Zippo lighter cases, but not Slim or 1935 Replica cases. Case sold separately.