American Educational Products LLC has been supplying the highest quality classroom materials domestically and internationally for more than 70 years. With our creative in-house product development team, we are able to introduce new products on a yearly basis. Our products have helped teachers bring the joy of discovery, through hands-on and investigative learning styles, to generations of students. We are sincerely proud of our legacy and we promise to strive to meet the needs of present and future students as they prepare to become knowledgeable and successful world citizens. This apparatus is used to demonstrate the transformation of potential energy into kinetic energy in a fun and interesting way. Challenge your students to calculate the minimum height that the steel ball can be rolled down the track and still have it complete the loop without breaking contact with the track. The unit measures 420mm x 100mm x 430mm. Instructions provided. American Educational Products have a lead ship time of 21 days.