Check the listing for details. GraviTrax Kinetic Blast The Ultimate Marble Run OPEN BOX - NEW. Condition: New: Other (See Details). Listed at 34.99 USD. The GraviTrax Kinetic Blast is the ultimate marble run set from Ravensburger, featuring 159 pieces made of durable plastic. With a STEM theme, this set is designed for ages 8 and up and is part of the GraviTrax product line. The open box includes everything needed to create a mesmerizing marble run experience, providing hours of fun and entertainment for kids and adults alike. This set is perfect for building and customizing unique tracks for the marbles to traverse. Open box - NEWThe GraviTrax Kinetic Blast is the ultimate marble run set from Ravensburger, featuring 159 pieces made of durable plastic. With a STEM theme, this set is designed for ages 8 and up and is part of the GraviTrax product line. The open box includes everything needed to create a mesmerizing marble run experience, providing hours of fun and entertainment for kids and adults alike. This set is perfect for building and customizing unique tracks for the marbles to traverse. Open box - NEW