This is the Fin Alignment Guide from Estes.
Suitable for Ages 10 & Older with Adult Supervision for Those Under 12.
FEATURES: Fast & accurate fin alignment for three or four finned rockets
No more guessing where your balsa fins go, this guide does it
all for you
Works with 3/32" (2mm) or 1/8" (3mm) balsa
Easy to follow instructions are included
INCLUDES: One Fin Alignment Guide
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
updated tlc 1/10/13