The Summit is a fun little (well not really little as it stands over 20 inches tall) rocket and comes fully assembled. Hours of flying enjoyment is what you will get from the Summit. RTF - Ready to Fly Length: 20.25 in. (51.4 cm) Diameter: .74 in. (19 mm) Estimated Weight: .85 oz. (24.1 g) Recommended Engines: 1/2A3-4T (First Flight), A3-4T, A10-3T Plastic Fins, Streamer Recovery Projected Max Altitude: 525 feet (160 m)