Hand-crafted and sanded for hours of building fun. Way back in 1951, our business was founded on these blocks, and for a great reason. Kids play with them week in and week out, year after year. The unique shapes of the blocks challenge kids with abstract concepts such as "length," "volume," and "fractions" while they are playing! This is not only fun, but constructive play! All important parts of outdoor backyard swing set fun!