The RT Franklin Sparrow is the plastic shape listed as a mid-range in the Franklin Sports Disc Golf starter set. This disc is made of a soft, very un-durable plastic type that is quick to wear and easily bends. Although it is listed as a mid-range, the disc mold used is exactly the same as the Albatross (which is listed as a driver). Regardless of what this disc is listed as, it does not fly well, but the aerodynamics of the disc make it too understable to throw as it immediately flips sideways, falls out on the ground, and begins to roll. The Sparrow could be listed as a roller disc if it was possible to control, but it’s very hard to make this disc roll straight as it usually likes to turn right and curl in a circle.
Because this disc is so understable, it is not recommended for any disc golfers above the age of six years old. 
I got this disc in a set. It flies very well and straight. I use it quite often. I am new to the game but I find this disc flies true. I have used it a lot and it is still in good shape
I agree with David in that the one i got in the 3 pack flies straight when thrown straight, with an overstable finish.
Have to disagree with Captain Chuck’s assessment that it is just a “white” version of the Albatross. All three of mine in the set are visibly different designs and have different flight patterns.
They are inexpensive starter discs so as long as you know that, there is nothing wrong with investing a few bucks in them if for no other reason, to have something to throw in water situations where you don’t want to lose your good Innova or Discraft stuff.