Tech Deck - Build-A-Park - Flat Ramp Grind Rail Customize your park by building it your way and adding additional Build-A-Park sets (each sold separately). Use the Build-A-Park with your Tech Deck fingerboard collections or Tech Deck BMX. Learn new tricks & tips from TechDeck.com and become a pro in no time! Tech Deck Build-A-Park is for skate-lovers ages 6+. No batteries required.