effe is a brand of flute accessories made from materials of eyeglass frames. The material, cellulose acetate, was born in Italy and has various meanings of "F": FUKUI (Fukui), FACTORY (factory), and FUE (whistle). We have created a whistle that can be used as an accessory made of eyeglass material, as if it were a talisman to be worn at all times in case of a disaster, with a focus on a high frequency sound that can be heard by rescue dogs.