A 3V motor allows you to create very different movements! Build up several models with one set Age, 8+ Number of models, 20 Number of parts, 261 Erector Set, 20-Model Set, #836520E EBM836520ERegular Price: $44.99Sale Price: 31 YEARS OF GREAT LOW HOBBY PRICES If You Have Questions, Please Call Toll Free, 1-800-225-6509 Ask for Doug or Sue