Koa Koa
Koa Koa: Build a Hand Crank Doorbell
A simple, fun and effective kit to get your little engineer thinking about gears and cause and effect!
This kit contains everything you need to build a doorbell for your bedroom. Once assembled, turn the crank: the gears engage the hammer which strikes the bell. Decorate it to your liking. Includes booklet introducing different types of gears.
6 years and up recommended
