This is the BT-60 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-60 nose cone INCLUDES: Four BT-60 Body Tubes SPECS: Inside dimension: 1.595" (40.5mm) Outside dimension: 1.64" (42mm) Length: 18" (45.7cm) COMMENTS: Use tube couplers ESTT3196 to join tubes of the same diameter, or use as support while cutting. kr6/19/01 ir/jl updated tlc 12/14/12