LRP aluminum fan holder is the ultimate accessory to mount cooling fans in your 1:8 cars and keep motor running cooler. This blue anodized aluminium holder will securely hold up to 2x 40x40x10mm cooling fans. Designed to withstand the roughest conditions in 1:8 racing or backyard bashing, this accessory is widely recommended part to increase lifespan and performance of the motor. Source LRP: http://www.lrp.cc/en/product/lrp-worksteam-alum-fan-mount-41mm-motordiam-for-2x40mm-fan/