Kinetic Carousels demonstrate two types of energy: potential energy and kinetic energy. Any selection of a product variant defaults to a single variant for all products; for example, if a product is offered in small, medium, large in red, blue, black the customer can choose any combination of variants but only small & red is added to the cart. These updates resulted in relatively minor changes to the majority of emission factors utilized in WARM. Top of Page WARM Version 7 This version was released in August 2005 and contains several updates and improvements. Paper tubing i.e. paper towel rolls, will create too much friction with the plastic lid. It’s also important to make sure your tube is wide enough for the rubber band to twist and unwind. Yes, I’m totally good at that kind of thing.