The clever and functional Portal Bookends keep your books in order. They do look exactly like a test subject going through a portal on one side and out the portal on the other. The left side features half of a test subject going through an orange portal, while the right side features the other half of the test subject coming out the blue portal. They are made of shiny & durable aluminum, non-slip rubber padding on bottom and their dimensions are 4 x 5 x 2.25 inches.