Table top Roller Coaster, 90 mm diameter glass or mug seat will fit most sizes, and wheels do rotate freely. There is 2 ways to print this model: 1. print entire assembly with body and wheels. 2. print body and wheels separately for more color options. Recommend printing "white strong & flexible" for best price and "do it yourself" custom painting. Wheel are designed to spin! Custom engraving is available by request for free! Enjoy!