Manufacturer Description

This is the Hot-Racing 30x30mm Motor Heat Sink/ESC Cooling Fan.

FEATURES:
Fastens to heat sink of motor or on top of ESC to cool electronics
    and prolong life of motor or ESC
Thirty day limited warranty beginning at date of purchase-valid
    in the United States only

INCLUDES:
30x30mm Motor Heat Sink/ESC Cooling Fan with Wire Lead and 2-pin
    Connector

SPECS:
Length: 1.2" (30mm)
Width: 1.2" (30mm)

BOX DIMENSIONS: 1.88" W. X .38" H. X 3.00" L.
BOX WEIGHT: .02 LBS.