Amaco glaze "Class Packs" are sets of several glazes in for easy ordering. There are sets of underglaze, Low-fire glazes and High-Fire series.
Most are groups of favorites, so it is simple to try out a line of glazes by getting several pints most common ones in one easy pack.
They are class packs because they make it easy to order and re-order glazes for the classroom !
Amaco Pottery Making Glazes : Class Packs