Set comes with 490 half inch plastic squares and triangles that fit perfectly into the square holes of the grid. Create your own patterns and pictures or follow the ones provided. There are 6 full size pictures that fit under the grid allowing for simple one to one matching to complete the picture. The 24 pictures in the booklet are smaller and so must be copied by counting and spatially figuring out where to start and when to change colors. Handling and placement of the small, colorful pieces facilitates development of a refined pincher grasp. But for removal everyone loves using the special suction tool provided. Also try using one of our tweezers to help with placement and removal. A terrific product you will reach for again and again!