18 months & up. Spark your child's inner architect with these colored octagonal blocks. These sturdy, double octagon blocks are easy to stack and the jumbo size makes them ideal for the beginning builder. Watch their imagination soar! Children can follow their own plan, or they can share a friend's vision and work together to create something they never dreamed of. The plastic blocks are great for inside or outside. Includes 6 colors, 6 of each.