How it's made. The cup hangs from pins at its rim, so a drink's weight sits below the pivot and the cup swings level when the car brakes or corners. The sockets are open slots: the three parts drop together under gravity and lift apart to wash. The skirt sits in a standard 68-78 mm car cup holder; the cup takes a 12 oz can or a bottle up to 70 mm. PETG, printed the right way up, no supports.