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In page Tyer's Electric Train Tablet:

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Tablets are in the form of a disc made of metal or fibre (with a gunmetal weight at the top of the magazine), engraved with the names of the stations between which it is valid, and also provided with notches (also called configurations) or other indentations to ensure that it would fit only one pair of instruments. They were often painted in distinctive colours as an additional visual identification in areas where consecutive sections could each be controlled using the same type of instrument. The diameter of the tablets varied between the different patterns of instrument: those for the No 1 were the largest, the smallest were for the No 5 and No 7, whilst the Nos 2,3,4 and 6 all used tablets about 4.5 inches (110 mm) in diameter.