Keeps kids busy for hours

My son is 12 and really doesn't like playing with toys very much any more. But he absolutely loved these! As soon they came in the mail, he played with them all afternoon that first day. Showing me how he can make cubes, triangles and other shapes. Then making towers and houses and all until I told him he needed to put them away so we could have dinner. He wants another set to have more options for building, so I guess we will be getting more.