Check the listing for details. Robson Plus Dart Flights System F-Shape no need for rings springs (2202). Condition: New. Listed at 9.76 USD. Robson Plus Dart is an amazing Flight system that fits all stems nylon or metal. It is long lasting, no need for rings or springs, retains its 90 degree shape, has a built in flight protector. BUILT-IN CAPSULE SHAFT PROTECTOR: The built-in shaft protector eliminates the inconvenience and cost of punching holes for the shaft protector such as stem rings, aluminum band, champagne and shell lock rings. These holes further weaken the flight that may lead to tearing and ripping of the plastic. The built-in capsule protector protects the shaft and eliminate robin-hooding through its basic design. UNIVERSAL SHAFT SLOT: The universal shaft slot eliminates the cost of using expensive specialized shafts to fit the flight and eliminates the inconvenience of adjusting to using the specialized shafts that comes with other designs. Any regular nylon and crystal flights will tightly fit the Plus Flight and other types of shafts also fit the slot. The universal shaft slot makes the Plus Flight very cost effective. REINFORCED WING PROTECTOR: The Plus Flight is designed with a reinforced wing protector to minimize the tearing and ripping of plastic flights. By reinforcing the most common site of ripping in the plastic flight the Plus Flight is more durable and will last longer than other plastic flights. BUILT-IN FLIGHT PROTECTOR: The built-in flight protector protects the flight from robin-hooding and helps fortify the 90 degree angle of the wing span. The thickness of the wing span appropriately meets the need to maintain the cross-form of the 90 degree angle.