Want to pack some real power? The C6-5 is your engine! This C engine is the highest impulse engine in a bulk pack. This engine will send your rockets out of sight! Estes engine bulk packs are convenient and include everything you need to prepare for 24 rocket launches. Included are 24 rocket engines, 30 model rocket starters, 24 reusable starter plugs and 75 squares of recovery wadding. These C6-5 engines may be used with the rocket bulk packs (Alpha III, Generic E2X, Alpha, Viking and Wizard) or other compatible Estes rockets. Whether you are launching rockets at school with students, at a youth group activity or rocket club monthly launch, Estes engine bulk packs are a must. <br /><br /> Engine Specifications: <br />Length: 2.8 in. (7.1 cm) <br />Diameter: .69 in. (18 mm) <br />Estimated Weight: .85 oz. (24.1 g) <br /><br /> ***PLEASE NOTE: This item will ship by US Postal Service only. You MUST HAVE a physical mailbox or Post Office box for delivery.