This is a self-correcting short vowel activity. The vowel is on the lock and short vowel pictures on the keys. Match the correct picture to the correct vowel and check by unlocking the lock. Each lock came with two keys so there are two short vowel pictures to go with each lock. The locks have the capital letter on one side and the lower case on the back. Each key has a picture on the front and the name of the picture on the back. My kiddos love this game!