This set of 6 World Aerobatic Natural Cork & Permanent Plastic Coasters from the Tenth World Aerobatic Championships in Oshkosh, Wisconsin features a square shape and a 3.75″ size. Made of lightweight and stackable material, these coasters are washable and perfect for everyday use. The colorful design includes an airplane pattern in honor of the FAI 80 aerobatic championship. Made in the United States by Cornimar, this original coaster set captures the essence of aerobatic competitions from the 1976-1985 time period.