This mouthpiece has a wide comfortable rim that is very round and soft. The cup is extremely shallow. The entrance to the throat is rounded, which allows plenty of air flow despite the low cup-volume. The throat is a #27, and the backbore is the Legends S. Slotting with this model is excellent. The design elements of this piece maximize endurance, range and sound for the player. The Sizzle is great for those players who need a little wider inside diameter but like a shallow cup. Use the Sizzle when you want to play high and hot lead!