Accel's distributor cap and rotors are precision ground and highly polished compression and injection molded for a high quality product. The high performance 60kV rated tan alkyd molding compound (Mineral filled polyester) is designed to protect against arc-through and crossfire. Compression molded caps are stress-relieved immediately after molding in special fixtures to ensure dimensional stability. High conductivity, corrosion resistant brass/copper inserts and stainless steel rotor springs provide unrestricted spark energy flow. Accel's heavy-duty black and gray caps and rotors are available for less demanding applications.