​ 635-piece large scale Twin Mill Hot Wheels building toy for fans and collectors ​ Buildable race car includes a detailed interior, removeable engines and panel Features a cockpit that opens, rolling wheels, adjustable steering wheel and more Pieces combine with all MEGA Hot Wheels building toys and are compatible with other name brands ​This Adult Builders set is a great build-and-display toy for adults to reward their inner child​ Like a racing trophy, this Adult Builders edition of the iconic Twin Mill is made for your display case. This large-scale race car is authentically designed with deluxe features like a detailed interior, removeable engines and panel, a cockpit that opens and so much more. This retro icon may have been made for high performance, but now it's built to show off.