Visionchart Executive Letterboard 1200 X 900MmDescriptionSpecificationsShipping The Number 1 choice for easy to read changeable information systems! All Executive signs feature a grooved felt background at 6. 35mm spacing (1 4 inch) Plastic letters simply slide into these grooves to create a professional looking.. changeable sign 1200 x 900mm Due to freight costs, some orders may incur a delivery charge and this will vary depending on the order, particularly in regional areas. Delivery costs can