The Slinger is a fun little rocket and comes fully assembled. Hours of flying enjoyment is what you will get from the Slinger. RTF - Ready to Fly Length: 14.25 in. (36.2 cm) Diameter: .74 in. (19 mm) Estimated Weight: .74 oz. (19 g) Recommended Engines: 1/2A3-4T (First Flight), A3-4T, A10-3T Plastic Fins, Parachute Recovery. Projected Max Altitude: 550 feet (168 m)