OK .....understood..............here is the link to Innova's site.
More specific !!!
Here is how it is stated , " About the SL or Starfire-L
The SL is a fast, dependable disc with a long straight flight and excellent glide. This disc can add measurable distance to your drives. With its quickness, slight high speed turn, long glide and low fade, the SL will fly a long way. The Pro version is called the Pro Starfire."