Accessories:Cooling Fan Lid-1pc35mm Heat Sink-1pcCooling Fan-1pcStainless Steel Flat Head Screw 3x16-4pcsPlug Adapter-1pcProduct major function & usage:Help cooling down the motorMajor advantages of upgrading to this product:This product brings a double cooling effect on the motor by providing a cooling fan on top of the heatsink, to achieve better result.Other special notes and comments:Suitable for all 540 motorsWe use a quality light weight high tensile strength aluminum 6061 T6 and is then anodized with scratch resistant colorsWe also have a big selection of multiple colors available now!! Let¡¯s ¡°hop up¡± your vehicles to give them the best looks and performance on the market ¡¦ colors are available in blue, red, grey silver/gun metal, orange, green, black, brownWe have taken the time to individually, to carefully QC every part ¡¦ this is another advantage of GPM having our own concept design fabrication and manufacturing facilities ¡¦ almost all other companies outsource all of their production do very little QC never taking the time to unpackage, QC, then repackage their parts before shipping. GPM offers the best Quality Control and after product sold services, to include constantly making our pro team racers and staff available for any question or advice