Formation trays are listed as the frontage (width) by the depth. See the drawing below for guidance.

Heavy Duty Movement Trays

Code	Name	Image
GMT_25x50mm	Movement Trays for 25x50mm Bases
GMTxx_25x50mm	Movement Trays Inserts for 25x50mm Formations (Flex Magnet and Flex Steel)
GMT_25mm	Movement Trays for 25mm Bases
GMTxx_25mm	Movement Trays Inserts for 25mm Formations (Flex Magnet and Flex Steel)
GMT_20mm	Movement Trays for 20mm Bases
GMTxx_20mm	Movement Trays Inserts for 20mm Formations (Flex Magnet and Flex Steel)
GMT018	Heavy Duty Plywood Movement Tray Kit. Wedge Formation. 25x50mm, 10 Model Wedge
GMT018m	Magnetic Insert for GMT018
GMT018fs	Flexible Steel Insert for GMT018