This model has a unique extremely wide and flat rim. Notice the outside rim diameter of 1.126 inches! There is some undercut for chop room, too. The cup is shallow, with a shape inspired by the famous ‘SL’ cup. The entrance to the throat is rounded to allow for plenty of air flow, despite the low cup-volume and fat rim. Slotting with the Fat-tastic is excellent. Customers that have played the Fat-tastic have found it perfect for both lead and legit playing.