Develop their ability of hand on, and improve train observation, thinking and analytical skills. Size: about 29x8.5x13cm/11.42x3.35x5.12in, will not take up too much space. Explore and understand the fundamental principles of physics mechanics and friction with physics teaching aid. Adjustable sloped board can cause 's curiosity, become the parent of the education of 's helpers. Perfect for classrooms, school programs, libraries, birthdays, and stem-loving families, and collaborative learning.