Iwachu Japanese incense holders The Iwachu company is world famous for its production of cast iron teapots. It also produces many items for domestic use such as bells, chimes and incense holders. All Iwachu incense holders are made of cast iron and allow the burning of standard size sticks (approx. 2 mm). For larger sticks (e.g. NK Pure from Nippon Kodo or Kai Un Koh from Baieido) the Yume No Yume holders are more suitable.