You can choose from a number of different wooden templates including flowers, cute animals and maybe even a toy. They come with a printed sheet with “happy birthday” words that you can stick on inside or outside. There are 3 A6 sized cards and with matching envelopes in a pack. A6 is about 10 cm by 13 cm i.e a quarter of the size of A4.
There are a mixture of cards in the pack, some portrait some landscape while some white some coloured. These packs are mainly pastel colours and are more likely to be pink than blue.