This easy-to-build plane is made of pre-cut pieces of balsa wood. The double-wing design is stenciled with dramatic details for an authentic World War I look, with the spacing of the structure maintained by light plastic pieces to keep everything in place.  
— “Balsa wood planes, by Guillow,” said Joel Hardy of Magpie Toys in Red Lodge, Mont., of the store’s best-selling flying toys.
— Eight percent of 68 retailers reported Guillow’s balsa flyers as top sellers among aircraft in October 2008.