The cards are small enough to be held easily by kids hands. Each set of cards introduces one combined-letter sound and then introduces common words that use it. Each card includes the letter combination on the top and the phonetic diacritical marks for the pronunciation (the kids don't need to know this--though it can help them realize when different letters sound the same). The letter combination is highlighted in each word. Here's my example:
I've been making my own words lists for a while and it can take a long time while I try to find words with a specific letter combination (like 'ay' or 'ai' for a long a sound, 'y' at the end of a word usually sounding like a long e, or 'ow' sounding like 'ou' or a long o sound). I just found this website though, which has helped immensely. All I need to do is type in the particular letter combination with the right wildcard symbols (- for a single letter location or * for any number of letters) and a whole big list comes up. of course I need to pick out the sound I'm actually looking for and use words that are more common, not obscure or technical.