The Irregular series consist of 183 shapes from 3XL to screw-on feet. The Irregular series is intentionally deceptive with the “sweat spots” not necessarily where you expect them to be. They are great for challenging newer climbers while keeping experienced ones on their toes. Finding the best spot to hold these Irregular jugs can be tricky. But that is what makes them fun. Another amazing series by Andy Nelson. This 3X jug set comes with 1 shape.