Our STS-131 Mission Lapel Pin is a high quality enamel pin. It is 1" in diameter.STS-131 is targeted for launch on March 18, 2010. STS-131 mission will be flown by Space Shuttle Discovery, The primary payload is scheduled to be a Multi-Purpose Logistics Module. The mission will also perform an R&R on an ammonia tank assembly outside the station and return a LWAPA plate, located on the Columbus module. The mission also includes several on-board payloads, this mission has the most payloads since STS-107.