Materials:silicone 

Custom size based on requirement.

Hardness:30-80 shore A

silicone With density value 1.2T/m3 . the silicone rubber has its own advantage ,such as the wide temperature range from 
-50℃ to +170℃ , low compression deformation ,  UV resistance , ozone resistance  , weather resistance and aging resistance . 
oppositely , its disadvantage listed as low tear resistance , easy to catch dust  .