Billet power pulley, plain with a degree ring. Power pulleys have a smaller overall diameter of 5 3/4 inch. This means they lower the speed of the cooling fan. This offers approximately 10% more horse power plus quicker throttle response. It is recommended for Beetle models that run over 4500rpm. These require a smaller fan belt - use AC903137
These pulleys should not be used on Type 2 models as overheating can occur.