1. All parts in touxh with raw materials are made of stainless-steel. 2. The hull is castinjg precisey with aluminium, smooth surface and good performance for keep temperature 3. Blower be protected off mote, avoid mote drop im raw. 4. Pail and shose windowing for view, you can observe word case insede directly. 5. Style heat cylinder is crooked, avoid the material fall into and cause the heat tube burm down.