Estes 1755 Viking Rocket Bulk Pack, Includes 12 Model Rocket Kits (Intermediate Skill Level)12 Pack intermediate skill level Viking model rocket kits: each kit is individually wrapped with materials and step by step instructions required to assemble the rocket perfect for schools, clubs, and rocket demonstrations. This rocket has 48 possible fin configurations that can be used for it. Students can hypothesize how their fin arrangement will affect the rockets flight then put it to the test by launching it. Skill Level: The Viking is an