Always use on a mat
Back-flow can damage varnished surfaces
Only use on a flat and stable surface. 
Do not place on painted or polished surfaces. 
Only to be used with one Back flow incense at the time.   
Never leave unattended  whilst in use.  
Keep out of reach of children.
Size of the Backflow Incense Burner: 
Lenght 13cm, Width 7cm, Height: 14cm