Cementing plug have been designed to decrease drill out time.  
These series of cementing plug have reinforced locking teeth built into the plugs, which lock together between the plugs and  the float equipment to eliminate rotation of the plug during drill  out.
These  plugs are made of Graded Rubber with Aluminum or Phenolic core inside, No other metal parts are used . 
These plugs are completely PDC drillable.
Operating rage of temperature with Aluminum core is up to 200 degree Fahrenheit.  
Plug can be ordered for higher operating  temperature and operation in either synthetic or mud fluids.
Available sizes from 4-1/2″ to 20″.