This is the BT-80 Model Rocket Body Tubes by Estes. Suitable for Ages 10 & Older with Adult Supervision for Those Under 12. FEATURES: Strong and lightweight tubes Used for custom model rockets or repair work Plain brown tubes with a thin wax coating Can be cut to needed length Works with the NC-80b nose cone INCLUDES: Two BT-80 Body Tubes SPECS: Inside dimension: 2.56" (65.7mm) Outside dimension: 2.6" (66mm) Length: 14.2" (36.1cm) COMMENTS: Use tube couplers to join tubes of the same diameter, or use as support while cutting. kr6/19/01 ir/jl updated tlc 12/14/12