If you’re a beginner, you might want to start out with a 6–7-inch round baking tin to minimise the possibility of overflow. Square tins usually come in 20x20cm or -23x23cm sizes - or thereabouts.

23cm/9in and 30cm/12in round cake tin, thin cake boards of respective sizes, and 20cm/8in, 28cm/11in, 35cm/14in thick cake boards. You will also need eight dowelling rods, eight cake pillars and ...