The product is a set of Guernsey World War II aviation military stamps issued in 2018 to commemorate the RAF centenary. These stamps are Mint Never Hinged, meaning they are in pristine condition and have never been used. The stamps feature military-themed designs related to aviation during World War II, originating from the United Kingdom. This collection is a significant addition to any stamp collector's portfolio, showcasing a piece of history from a pivotal period in British military aviation.