A neat puzzle, using twenty balls in four blocks. There are two strings of 4 balls, and two blocks of 6 balls. The object of the puzzle is to form them into a perfect pyramid. This is a large size model–the pyramid measures about 3.5\” in Height With Base, and comes with instructions. Makes an ideal gift or promotional item. It also have Bonus Pen Stand slot makes this Unique Table prop for Puzzle as well as Pen Stand.