Woodland Scenics Pine Car Derby Aerodynamic Pre-Cut Designs Hammerhead This package contains one 1- 3/4x7x3/4 inch hammerhead This is a great item because it is lean with an aerodynamic body style and works well with PineCar round cylinder and CoG System weights It is also rough-cut and ready-to-finish and has pre-drilled axle grooves with extended wheelbase options