In February 2005, the Smarties tube was replaced with a hexagonal design. The rationale behind changing the design was, according to Nestlé, to make the brand "fresh and appealing" to youngsters; the new packaging is also lighter and more compact, and the lid (which is now a hinged piece of cardboard) has a card clip which holds the lid shut when it is folded over. The new lid still features a letter like the old plastic lids, but it is in the form of a "what is a [thing?" question similar to those asked on the TV show Blockbusters (which coincidentally were on hexagonal tiles), the answer for which can be read when the lid is open, next to the hole giving access to the rest of the tube. The hexagonal box is made of one piece of card which is diecut then folded and glued. The hexagon can also be stacked in many layers without the pile collapsing, which is an advantage at the point of sale. The last 100 tubes to leave the factory in York had a certificate inside them.