This is a tray to hold the ASTRA Opponent and Adventure cards for solo play of the board game Welcome to the Moon. Both cards slide into slots on the tray, and the flat panel at the front of the tray provides a little stability to the tray when writing on the cards. The flat panel also serves as a convenient reference, showing the distribution of numbers in the deck of Starship cards. The tray is only 16 mm tall, and will fit in the original game box without disturbing the box lid.