The UGEARS Model Marble Run Stepped Hoist Wooden DIY Model Kit is a 355-piece set that allows you to build a marble run with a stepped hoist feature. Made of wood, this kit is designed for ages 14 and up and comes in a box packaging. The set includes marbles and offers a STEM theme, perfect for those interested in mechanical models. With dimensions of 11.4 inches in length, 7.6 inches in height, and 10 inches in width, this kit is a great project for DIY enthusiasts looking to create a unique and intricate marble run.