Extreme Cool fan shrouds allow for optimal cooling of your brush less high performing electric motors, through shrouding airflow into and around the motor can, into the stator and stack. This results in properly cooling the heat effected components ( windings and rotor). +20*F over traditional mounted fan arrangements. An added benefit is sleek appearance as well as protection of your fan from impact. Fan shrouds are SLS printed Nylon material, that feature a high resistance to heat and fatigue. Form, Function and durability were the key points in the design process.