Zebra Stainless Whistling Kettle Classic 3.5LZebra are most well known for their famous loop handle pot, or billy can. However, they produce an extensive range of equally high quality cooking and outdoor equipment including this classic whistling kettle. SUS 304 stainless steel (same as the billy can) Use on the stove, fire, home or like us, the office as well! 3. 5 Litre. Foldable handle for storage. Hinged flap over spout prevents water contamination from dust, leaves, insects etc.