This is the Motor Cooling Blower Fan and Shroud from Castle Creations.

FEATURES: Fits motors with outside diameter between 1-1/2 and 1-7/8"
            (38 - 47mm) such as the Castle Creations Neu-Castle 2200 and 2650
          Plugs into receiver and drops motor temperature as much as 30°
          One year limited warranty through manufacturer beginning at date of
            purchase

INCLUDES: Fan with wire and connector, shroud and two zip ties

REQUIRES: Attaching to motor can and plugging into receiver

SPECS:    Length: 49mm
          Width:  44.5mm
          Height: 44.5mm
          Wire Length: (9.5")

                                                                   jxs 12/29/09
                                                              updt lmm 01.04.09
                                                                         ir/jxs