Pulley is made from billet alum. and hard black anodized for wear resistance. Pulley is 3.50" wide has a 2.00" register with six .375" bolt holes on a 2.782" bolt circle. Teeth are 11mm GT profile.
Due to the blower pulley getting thin on the 31 and 32 tooth pulleys those are made from 2024 alum. for greater strength on the two smaller sizes making for the more expensive cost.
Racer can choose size from drop down menu.