These flights have a perfect 90-degree angle for an accurate throw. They weigh the same as a standard flight. The soft and flexible material can easily bend for adjusting. Easy Fit…compatible with nylon and poly shafts only. Longer durability and no lamination.Pro flights can be used with the Pro Rings for a secure fit on any type of nylon or poly shaft. (Sold separately)When the Pro Flight is used with the Pro Rings and pushed onto the shaft, the Pro Ring goes over the top of the nylon or poly shaft preventing hard deflections by another dart hitting the back of your shafts.