BQLZR Titanium Aluminum Alloy 308003 Heat Sink Stock 380 Motor Cooling for RC1:16 Model Car It is suitable for RC 1:16 car with 380 motors only. It can increase your motors ability to air cool Part Number: 308003 Dimension: 35.5 x 25 x 24.5 mm /1.4 x 0.98 x 0.96 inch(L x W x H) Aluminum construction, blue in color Installs over motor can to help dissipate heat and prolong motor life