SBR or Styrene-Butadiene Rubber
SBR is a synthetic rubber has a good abrasion resistance. It is mainly used in automotive tires as it wears well and stands up to heat. SBR is also used the making shoe soles and heals, gaskets and can even be found in chewing gum.
The SBR with cloth insert is a fabric reinforced rubber sheet with fibers inserted into the rubber sheet to add stability and help reduce tearing.