A "Best-of" set with a power tool, 6 V motor and many moving parts! Build up several models with one set Age, 8+ Number of models, 50 Number of parts, 605 Erector Set, Best of 50-Model Set, #839550E EBM839550ERegular Price: $109.99Sale 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