1.Material of mainfold:aluminume allory  
2.Frame: plate aluminume and zinc steel board with 1.5mm  

3.vacuume tube:  58*1800mm

  
4.   12.15.20.25 tubes per /set. 

5.Heat pipe: heat pipe in the vaccum tube(like in the photoes)  
no water in the tube.no dirty.prevent frostbit. 

6.Woring pressure:0.6Mpa.

  
7.It can use as usual when one tube damaged.