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Includes 10 squares of clay. Each square weight approximately .25 ounces. Perfect for when you additional weight in the nose cone! Additional Information Technical Specifications 10 squares Clay Each square weighs .25 ounces and is individually wrapped. Estes model rocketry is recommended for ages 10 and up with adult supervision for those under 12. Unless otherwise specified, all models require assembly. Tools, construction and finishing supplies sold separately. In order to launch, a launch system, model rocket engines, starters and recovery wadding are required - sold separately-unless otherwise specified.