To enable this, create a smart collection named All Products and set the condition to 'Product price is greater than 0'. You can create a collection through the 'Collections' menu in Shopify admin. Or you can turn this section off through theme settings.
You will receive 10, 30 or 50 Random postcards with Fairies. There will definitely be postcards with the same design. Photo is just for example. Perfect pack for postcrossers.
size of a postcard : 15x10.5 cm