A Wing Coaster is a type of steel roller coaster manufactured by Bolliger & Mabillard where pairs of riders sit on either side of a roller coaster track in which nothing is above or below the riders. Development of the Wing Coaster began between 2007 and 2008 leading to the opening of Raptor at Gardaland, the world's first Wing Coaster, on 1 April 2011. There are currently eight Wing Coasters operating worldwide.