9 x 12 x 24 Ballistic rubber blocks; Modified Butadiene Rubber (SBR). Similar properties to NR but with improved aging and temperature resistance.  
Flame Resistance: Good (See ULReport) 
Sunlight Resistance: Good  
Weather Resistance: Excellent 
Water Resistance: Excellent
Flame Resistant Formula, High Quality Materials, Provides Range Safety, Easy Install.
107 lbs. per unit