This educational learn to read jigsaw puzzle from Starfall focuses on the short-'u' vowel sound by displaying words in "tags" attached to various objects. Instructions for educatinal extension activities are included. This puzzle has 24 heavy duty pieces for doing it over and over again. The size is 10"x13". The puzzle pieces are color-coded on the back so pieces don't get mixed up if you own another Starfall puzzle with a different short vowel. This puzzle is so appealing to children that they want to do it over and over again while they read the words to you.