Swan Double Boiling Ring - Stainless Steel The Swan Double Boiling Ring features two cast iron heating plates: 188mm and 155mm. It also disposes of a thermostatic control and thermal fuse for overheating. It has a stainless steel top panel, a non-slip feet and 1m cord. Comes with power on indicator lights Colour: Stainless Steel Dimensions: Depth: 29cm x Width: 48.9cm x Height: 10cm