EST3031 Star Trooper Mini Rock by Estes Rockets Part of the Estes Classic Series. Estes has gone back to the archives, pulled up old drawings and spec sheets and brought these fantastic flying machines back for old and new rocketeers to enjoy. This kit has been reproduced and updated while still retaining the classic lines of the original. Technical Specifications Skill Level 1 Length: 7.3 in. (19.6 cm) Diameter: .54 in. (14 mm) Weight: .3 oz (8.5 g) Wood Nose Cone, Laser Cut Wood Fins, Waterslide Decals, Streamer Recovery Recommended Engines: 1/4A3-3T, 1/2A3-4T, A3-4T, A10-3T Projected Altitude: 900 ft. (274 m)