The Ravensburger GraviTrax PRO Vertical Starter Set (‎26832) is a marble run set focused on a ships and boats theme, with 3D printed and custom printed features. Designed for ages 8 and up, this set is part of the GraviTrax product line and is compatible with K'NEX brand products. Made of plastic, this set offers an engaging building experience for enthusiasts of building toys and blocks. Released in 2021, this vertical starter set brings a new level of creativity and challenge to the marble run genre.