These Monster Truck risers are made to allow users the ability raise the Finish Line up off of their existing Super 6 Lane Raceway to allow enough clearance to race Monster Trucks. They connect into the existing 6 lane raceway track and raise it an extra inch allowing Most if not all monster trucks to fit under the raceway. All parts are printed 3D printed using PLA a plastic made from renewable resources such as corn starch or sugar cane , and are safe to use. Our products are not meant for children below the age of 3, and Adult supervision is recommended.