This is the Tube Cutting Guide by Estes. Suitable for Ages 10 & Older with Adult Supervision for Those Under 12. FEATURES: Heavy duty plastic guides slip easily onto your body and allows for precision cuts for specific lengths 5 guide sets are included: BT5, BT20, BT50, BT55 and BT60 INCLUDES: Tube cutting guide REQUIRES: Hobby knife (RMXR6909) COMMENTS: Due to small parts that could cause a choking hazard please keep away from children 3 years of age and younger For your safety and enjoyment, always follow the NAR Model Rocketry Safety Code while participating in any model rocketry activities tlc 2/6/12 updated tlc 1/10/13