The Roc, a very straight to slightly overstable flyer with good carry, is the number one professional mid-range driver. The Plus refers to the wall of the rim is angled instead of straight, which allows for an easier release out of the hand. These Rocs are made from ultra-durable Champion plastic and support the United States Disc Golf Championships. Each purchase comes with a certificate of authenticity that can be entered into a raffle for Innova schwag.