Class kits are designed so that every student in the class has their own set of Wrap-ups. If you want to see class scores go up, then you need this kit. These kits have 30 sets of the same operation, a corresponding Wrap-up Rap audio cassette, a Teaching Manual, and the Skip Counting Video with an audio cassette tape. Best of all it comes in an easy to organize case that travels easily from one class to another. Addition kit shown not included, purchase of this item is for Subtraction Kit.