Kettle in stainless steel mirror polished with melodic whistle in brass and handle in PA, black. Magnetic steel heat diffusing bottom. This kettle was our first designer kettle, heralding a new season of kettle ideas for ourselves as well as many other kettle manufacturers. The true heart of this design is the brass whistle whose pipes sing two notes, mi and si, when the steam blows through them, giving a particularly attractive melody. Sapper wanted to avoid giving the kettles whistle the usual irksome sound of the other kettles on the market.-sensorial design.